Don't fail on invalid SSL certs when checking documentation

Change-Id: I5d5f260f8429c67931c9c9b03176d8ce91b419cc
diff --git a/linkchecker.ini b/linkchecker.ini
new file mode 100644
index 0000000..c9e3b1c
--- /dev/null
+++ b/linkchecker.ini
@@ -0,0 +1,7 @@
+; skip SSL verification
+[checking]
+sslverify=0
+
+; check external files
+[filtering]
+checkextern=True