DOC Update maintainer guidelines (#383)

- don't use brand icon
- update language to reflect current state of affairs
- update links (looks like this used to be in "contributing" and the links didn't get updated when it moved)
- Remove unrelated information that already exists elsewhere
- Swap out outdated "contributing committers" reference for the CMS Squad (we're publicly using that terminology already)
- update "house rules" to reflect the things we actually do now

en/06_Project_Governance/03_Maintainer_Guidelines.md

@@ -1,43 +1,23 @@
 ---
 title: Maintainer guidelines
 summary: Cheat sheet for module maintainers
-iconBrand: wpforms
+icon: clipboard-list
 ---
 
-
 # Maintainer Guidelines
 
-This doc outlines expectations on maintainers of Silverstripe Core. It also forms the default expectations for maintainers of Supported Modules, unless more specific contribution guidelines are available for a module.
+This doc outlines expectations on maintainers of Silverstripe CMS. It also forms the default expectations for maintainers of [supported modules](./supported_modules/), unless more specific contribution guidelines are available for a module.
 
-Module maintainers are people taking care of the repositories, CI, documentation, source code, conventions, community communications, issue triage, and release management.
+Module maintainers are people taking care of the repositories, CI, documentation, source code, conventions, community communications, peer review, issue triage, and release management.
 
 One of the most important maintainer responsibilities is to collaborate with other maintainers. Another important role is to facilitate community contributions (such as issue reports and pull requests).
 
 [note]
-A lot of extra information is available in Silverstripe CMS documentation section [“Contributing to Silverstripe”](./).
+A lot of extra information is available in the [Contributing](/contributing/) documentation.
 All maintainers should be familiar with those docs as they explain many details about how we work.
 [/note]
 
-
-## What is Silverstripe Core
-
-Silverstripe CMS is powered by a system of components in the form of Composer packages. These packages will be categorised as either a _module_ or a _recipe_.
-
-The "core" of Silverstripe refers to the module packages owned by the "silverstripe" Packagist vendor that fall under one of the following recipes:
-
-* [silverstripe/recipe-core](https://github.com/silverstripe/recipe-cms)
-* [silverstripe/recipe-cms](https://github.com/silverstripe/recipe-cms)
-* [silverstripe/installer](https://github.com/silverstripe/silverstripe-installer)
-
-## What are Supported Modules
-
-In addition to Silverstripe Core, there are many [Supported Modules](https://www.silverstripe.org/software/addons/supported-modules-definition/)
-which have the backing of Silverstripe Ltd. While it's a good idea to apply the rules outlined in this document,
-work on these modules is guided by the 
-[Supported Modules Standard](https://www.silverstripe.org/software/addons/supported-modules-definition/).
-Commit access in Supported Modules is handled by agreement of the repository maintainers,
-or any additional guidelines outlined via `README` and `CONTRIBUTING` files.
-
+Refer to the [triage and peer review](/contributing/triage_resources/) for information about how those tasks are performed.
 
 ## Maintainer Roles
 
@@ -46,55 +26,33 @@ or any additional guidelines outlined via `README` and `CONTRIBUTING` files.
 The people looking after the Silverstripe Core modules.
 See the details on the [Core Committers](./core_committers) page.
 
-
-### Contributing Committers
+### CMS Squad
 
 Beyond the Core Committer role, there can be individuals which
-focus on core development work - typically sponsored through full-time product development roles by Silverstripe Ltd.
-These Contributing Committers require write access to core repositories to maintain their pace,
-often working alongside Core Committers. They are guided by additional rules:
-
- * Contributing Committers have write access to core repositories in order to work effectively with Github issues. They are expected to use those permissions with good judgement regarding merges of pull requests.
- * Complex or impactful changes need to be reviewed and approved by one or more Core Committers. This includes any additions, removals or changes to commonly used APIs. If that's not possible in the team, ping `@silverstripe/core-team` to get other Core Committers involved.
- * For these complex or impactful changes, Core Committers should be given 1-2 working days to review. Ideally at this point, the API has already been agreed on through issue comments outlining the planned work (see [RFC Process](request_for_comment]).
- * More straightforward changes (e.g. documentation, styling) or areas which require quite specialised expertise (e.g. React) that's less available through most Core Committers can be approved or merged by team members who aren't Core Committers.
- * Self-merges should be avoided, but are preferable to having work go stale or forcing other team members to waste time by context switching into a complex review (e.g. because the original reviewer went on leave). Any self-merge should be accompanied by a comment why this couldn't be handled in another way, and a (preferably written) approval from another team member.
-
-This role may be granted by any Core Committer,
-who should give other Core Committers an opportunity to weigh in on the decision.
-
+focus on core development work and are full-time employees of Silverstripe.
 
-### Triage
-
-Triage of issues and pull request is an important activity: Reviewing issues, adding labels,
-closing stale issues, etc. This does not require write access to the repository as a "Contributing Committer".
-This is a great way for active community members to help out, and start a path towards becoming a Core Committer.
-
-Triage roles may be granted by any Core Committer,
-who should give other Core Committers an opportunity to weigh in on the decision.
+The CMS Squad require write access to core repositories to maintain their pace,
+often working alongside Core Committers.
 
+CMS Squad members have write access to core repositories in order to work effectively with GitHub issues. They are expected to use those permissions with good judgement for merging pull requests.
 
 ## Guidelines
 
 With great power (write access) comes great responsibility.
 
 First and foremost rule of a maintainer is to collaborate with other maintainers. Follow the house rules and remember that others also care about the modules they maintain.
 
-
 ### House rules overview
 
- * Be friendly, encouraging and constructive towards other community members
- * Frequently review pull requests and new issues (in particular, respond quickly to @mentions)
- * Treat issues according to our [issue guidelines](issues_and_bugs), and use the [triage resources](triage_resources)
- * Don't commit directly to a release branch, raise pull requests instead (except trivial fixes)
- * Only merge code you have tested and fully understand. If in doubt, ask for a second opinion.
- * Follow the [Supported Modules Standard](https://www.silverstripe.org/software/addons/supported-modules-definition/)
- * Ensure contributions have appropriate [test coverage](../developer_guides/testing), are documented, and pass our [coding conventions](/getting_started/coding_conventions)
- * Keep the codebase "releasable" at all times (check our [release process](release_process))
- * Follow [Semantic Versioning](code/#picking-the-right-version) by putting any changes into the correct branch
- * Public API changes and non-trivial features should not be merged into release branches. 
- * Public API changes on master should not be merged until they have the buy-in of at least two Core Committers (or better, through the [core mailing list](https://groups.google.com/forum/#!forum/silverstripe-dev))
- * Be inclusive. Ensure a wide range of Silverstripe CMS developers can obtain an understanding of your code and docs, and you're not the only one who can maintain it.
- * Avoid `git push --force`, and be careful with your git remotes (no accidental pushes)
- * Use your own forks to create feature branches
- * We release using the standard process. See the [Making a Silverstripe CMS Core Release](making_a_silverstripe_core_release)
+* Be friendly, encouraging and constructive towards other community members
+* Frequently review pull requests and new issues (in particular, respond quickly to @mentions)
+* Treat issues according to our [issue guidelines](/contributing/issues_and_bugs/), and use the [triage resources](/contributing/triage_resources/)
+* Don't commit directly to existing branches, raise pull requests instead
+* Use forks to create feature branches for pull requests
+* Only merge code you have tested and fully understand. If in doubt, ask for a second opinion.
+* Follow the [Supported Modules Standard](https://www.silverstripe.org/software/addons/supported-modules-definition/)
+* Ensure contributions have appropriate [test coverage](/developer_guides/testing/), are documented, and adhere to our [coding conventions](/getting_started/coding_conventions/)
+* Keep the codebase "releasable" at all times (check our [release process](/contributing/release_process/))
+* Follow [Semantic Versioning](/contributing/code/#picking-the-right-version) by putting any changes into the correct branch
+* Be inclusive. Ensure a wide range of Silverstripe CMS developers can obtain an understanding of your code and docs, and you're not the only one who can maintain it.
+* Avoid `git push --force`, and be careful with your git remotes (no accidental pushes)