diff --git a/conf.py b/conf.py
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+# -*- coding: utf-8 -*-
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# This file does only contain a selection of the most common options. For a
+# full list see the documentation:
+# http://www.sphinx-doc.org/en/master/config
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+import os
+
+def get_version():
+    with open("VERSION") as f:
+        return f.read().strip()
+
+# -- Project information -----------------------------------------------------
+
+project = u'SD-Core Docs'
+copyright = u'2021-current, Open Networking Foundation'
+author = u'Open Networking Foundation'
+
+# The short X.Y version
+version = get_version()
+
+# The full version, including alpha/beta/rc tags
+release = version
+
+# -- General configuration ---------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# make all warnings errors
+warning_is_error = True
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.autosectionlabel',
+    'sphinx.ext.coverage',
+    'sphinx.ext.graphviz',
+    'sphinx.ext.ifconfig',
+    'sphinx.ext.intersphinx',
+    'sphinx.ext.mathjax',
+    'sphinx.ext.todo',
+    'sphinxcontrib.spelling',
+    "sphinx_multiversion",
+]
+
+# require document prefix on section labels
+autosectionlabel_prefix_document = True
+
+# Text files with lists of words that shouldn't fail the spellchecker:
+spelling_word_list_filename=['dict.txt', ]
+
+# sphinx-multiversion prep, run in each versioned source directory
+prep_commands = [
+]
+
+# inlcude only the branches matching master and aether-*
+smv_branch_whitelist = r'^(master|sdcore-.*)$'
+
+# include all remote branches
+smv_remote_whitelist = r'^.*$'
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = ['.rst']
+
+# The master toctree document.
+master_doc = 'index'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = [
+        '*/LICENSE.md',
+        '*/vendor',
+        '.DS_Store',
+        'Thumbs.db',
+        '_build',
+        'venv-docs',
+        'requirements.txt',
+]
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = None
+
+# -- Options for HTML output -------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+html_logo = '_static/sdcore.svg'
+
+html_favicon = '_static/sdcore-favicon-128.png'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+html_theme_options = {
+    'logo_only': True
+}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# The default sidebars (for documents that don't match any pattern) are
+# defined by theme itself.  Builtin themes are using these templates by
+# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
+# 'searchbox.html']``.
+#
+# html_sidebars = {}
+
+# -- Options for HTMLHelp output ---------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'SD-CoreDocs'
+
+
+# -- Options for LaTeX output ------------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (master_doc, 'SD-CoreDocs.tex', u'SD-Core Docs',
+     u'ONF', 'manual'),
+]
+
+
+# -- Options for manual page output ------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'SD-Core Docs', u'SD-Core Docs',
+     [author], 1)
+]
+
+
+# -- Options for Texinfo output ----------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (master_doc, 'SD-Core Docs', u'SD-Core Docs',
+     author, 'SD-CoreDocs', 'One line description of project.',
+     'Miscellaneous'),
+]
+
+
+# -- Options for Epub output -------------------------------------------------
+
+# Bibliographic Dublin Core info.
+epub_title = project
+
+# The unique identifier of the text. This can be a ISBN number
+# or the project homepage.
+#
+# epub_identifier = ''
+
+# A unique identification for the text.
+#
+# epub_uid = ''
+
+# A list of files that should not be packed into the epub file.
+epub_exclude_files = ['search.html']
+
+
+# -- Extension configuration -------------------------------------------------
+
+# blockdiag/etc. config
+
+rackdiag_antialias = True
+rackdiag_html_image_format = "SVG"
+rackdiag_fontpath = [
+    "_static/fonts/Inconsolata-Regular.ttf",
+    "_static/fonts/Inconsolata-Bold.ttf",
+]
+
+nwdiag_antialias = True
+nwdiag_html_image_format = "SVG"
+nwdiag_fontpath = [
+    "_static/fonts/Inconsolata-Regular.ttf",
+    "_static/fonts/Inconsolata-Bold.ttf",
+]
+
+# -- Options for todo extension ----------------------------------------------
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = True
+
+# -- Options for linkcheck ---------------------------------------------------
+# The link checker strips off .md from links and then complains
+linkcheck_ignore = [
+    r'https://jenkins.aetherproject.org/.*',
+    r'https://gerrit.opencord.org/.*',
+]
+
+linkcheck_timeout = 3
+linkcheck_retries = 2
+
+# -- options for Intersphinx extension ---------------------------------------
+
+intersphinx_mapping = {
+    'sphinx': ('https://www.sphinx-doc.org/en/master', None),
+    'sysapproach5g': ('https://5g.systemsapproach.org/', None),
+    'sysapproachnet': ('https://book.systemsapproach.org/', None),
+    'sysapproachsdn': ('https://sdn.systemsapproach.org/', None),
+    }
+
+def setup(app):
+
+    app.add_css_file('css/rtd_theme_mods.css')