In order to have a dedicate chat room for tree issues with a high signal to noise ratio, we've separated out a new `tree-gardener` channel from the `tree-status` channel on Discord. This updates the gardener docs to reference the new human-centric tree-gardener chat.
I've removed the line suggesting that people avoid spamming the room with requests for "when will this be resolved?" and "can I get an update?" since the doc is aimed mostly at the gardener themself and and not likely being read by those on chat asking "when will the tree be fixed?" Recently this hasn't been a source of noise.
This is intended to replace the currently internal-only document for flutter/packages gardeners. It is a hybrid of the existing document and the Flutter-Framework-Gardener-Rotation.md document (in order to try to improve consistency relative to just moving the existing doc as-is).
This puts the wiki pages owned by the Tool team into the docs/tool directory as planned in [flutter.dev/go/migrate-flutter-wiki-spreadsheet](https://docs.google.com/spreadsheets/d/1x65189ZBdNiLRygpUYoU08pwvXD4M-Z157c6pm8deGI/edit?usp=sharing)
It also adds the tool team labels to the label bot for future PRs.
Changes to the content were only updating cross links, or link to refer to the main branch rather than master.
Remaining links to the wiki will be updated once all other pages have finished moving, they still work in the meantime.
Part of https://github.com/flutter/flutter/issues/145009
