It looks like wiki was removed and replaced with various documentation pages.
There used to be pages such as:
These would be a handy reference to use in answering questions on SO since they were pretty decently written and there wasn't really anywhere else that documented a lot of this stuff.
Now, when looking for those pages, it seems they simply don't exist anymore rather than being moved somewhere else.
What happened to these pages and what would be a good replacement for adding reference links in SO answers?