Test for broken permalinks against RSS feed
First pass at #335 (closed), using an in-tree tracker for post permalinks which requires manual updates, but can catch whether we've had:
- Posts created but not added to
permalinks.yml
- Posts deleted from the repo but not from
permalinks.yml
If deleting a post from the repo and the permalinks.yml, hopefully that'll make you think that you're trying hard to bypass the checks and that it's causing a problem!