The current build process in docs-webtemplate fetches various GitHub repositories as part of the `make fetch` step. This prevents an offline build and makes it difficult to test local changes to the documentation.

For the rest of AGL we already solve this issue using `repo`. I recommend migrating the docs to use `repo` or something similar to pull all the source repositories down in a controlled way so that the docs can be built offline easily and it becomes more straightforward to see where to make changes to the documentation and how to test them.