Refactor docs (#23752)

This was intended to be a small followup for
#23712, but...here we are.

1. Our docs currently use `slug` as the entire URL, which makes
refactoring tricky (see #23712).
Instead, this PR attempts to make future refactoring easier by using
slugs as an extension of the section. (Hugo terminology)
- What the above boils down to is this PR attempts to use directory
organization as URL management. e.g. `usage/comparison.en-us.md` ->
`en-us/usage/comparison/`, `usage/packages/overview.en-us.md` ->
`en-us/usage/packages/overview/`
- Technically we could even remove `slug`, as Hugo defaults to using
filename, however at least with this PR it means `slug` only needs to be
the name for the **current file** rather than an entire URL
2. This PR adds appropriate aliases (redirects) for pages, so anything
on the internet that links to our docs should hopefully not break.
3. A minor nit I've had for a while, renaming `seek-help` to `support`.
It's a minor thing, but `seek-help` has a strange connotation to it.
4. The commits are split such that you can review the first which is the
"actual" change, and the second is added redirects so that the first
doesn't break links elsewhere.

---------

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Author: jolheiser

docs/config.yaml

@@ -10,7 +10,7 @@ enableEmoji: true
 
 permalinks:
   post: /:year/:month/:title/
-  doc: /:slug/
+  doc: /:sections[1:]/:slug/
   page: /:slug/
   default: /:slug/