Docs code links (#7342)

* Update docs

- Add note about permission denied error

* Add macro for generating link to github code

* Implement similar feature for source directory links

* Adds helper function for link checking

* Allow for specification of "raw" file links

* Remove debug statement

* Generate list of available invoke tasks

docs/.gitignore

@@ -13,6 +13,10 @@ site/
 # Generated API schema files
 docs/api/schema/*.yml
 
+# Temporary cache files
+url_cache.txt
+invoke-commands.txt
+
 # Temp files
 releases.json
 versions.json