* Troubleshooting guide for filters.

After conversation with @flamber, split this into one guide for simple filters and one for linked filters. The explanation at the top of the second page may still need some work...

* Updating filter troubleshooting

* Troubleshooting when you can't see the tables you should.

* Why is my dashboard slow?

* Troubleshooting: can't send email

* Adding @flamber's batch script-style guide

* Update docs/troubleshooting-guide/cant-send-email.md

Co-authored-by: flamber <1447303+flamber@users.noreply.github.com>

* Update docs/troubleshooting-guide/cant-send-email.md

Co-authored-by: flamber <1447303+flamber@users.noreply.github.com>

* Update docs/troubleshooting-guide/cant-send-email.md

Co-authored-by: flamber <1447303+flamber@users.noreply.github.com>

* Fixing first item

* Addressing feedback

* Update docs/troubleshooting-guide/cant-send-email.md

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

* Update docs/troubleshooting-guide/cant-send-email.md

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

* Update docs/troubleshooting-guide/cant-send-email.md

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

* Adding flamber's comment

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Splitting entry

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Troubleshooting timezones

* Reformatting the filter troubleshooting guides

* Partial update to troubleshooting filters

* specify sql questions

* link

* update relative links

* more link fixes

* still more links

* specify dashboard filters

* fix typo

* Italicizing one more word

* Unifying all troubleshooting guides so far

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Update docs/troubleshooting-guide/cant-see-tables.md

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

* Incorporating suggestion

* Update docs/troubleshooting-guide/my-dashboard-is-slow.md

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

* Update docs/troubleshooting-guide/my-dashboard-is-slow.md

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

* Update docs/troubleshooting-guide/my-dashboard-is-slow.md

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

* Update docs/troubleshooting-guide/my-dashboard-is-slow.md

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

* Update docs/troubleshooting-guide/my-dashboard-is-slow.md

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

* Another small fix

Co-authored-by: flamber <1447303+flamber@users.noreply.github.com>
Co-authored-by: Jeff Bruemmer <jeff@metabase.com>
Co-authored-by: jeff bruemmer <jeff.bruemmer@gmail.com>

- 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