- Make all specific problems H2-level headings.
- Create a `doc-toc` div at the top for the table of contents.
  - Don't use `learn-doc` because we may want to style/show this one independently.
- Link to all problem headings.

Note: can't use metadata in a page header because our CI tools splat their own headers into these pages, so anything we add becomes part of the page body.

* First editing pass through troubleshooting guide

* Update docs/troubleshooting-guide/application-database.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/application-database.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/application-database.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/timezones.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/application-database.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/datawarehouse.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/docker.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Update docs/troubleshooting-guide/index.md

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Moving comma

Co-authored-by: Jeff Bruemmer <jeff@metabase.com>

* Remove old FAQ and update a couple of other docs

* Prettier [ci skip]

* Reset password rewrite and cleanup [ci skip]

* Add note about MySQL requirement [ci skip]

* Maz suggestion [ci skip]

Co-Authored-By: Maz Ameli <maz@metabase.com>

Co-authored-by: Maz Ameli <maz@metabase.com>

* Added error message + fix [ci skip]

* add quotes

Co-authored-by: Maz Ameli <maz@metabase.com>

* Log database connection error before humanizing it

The original, non-humanized error message may contain clues regarding the
error state, that might get lost in the humanization process.

* Log complete error at error log level

* Remove trailing colons from headings

* Reformat heading

* Add MySQL authentication troubleshooting

* Typo

* Reference MySQL 8 caveat in new MySQL section of admin guide

* Fix URL to troubleshooting guide section

* Update MySQL admin guide text

* "Fix" troubleshooting link