update: Add commit messages meta page

docs/meta/commit-messages.md

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+---
+title: Commit Recommendations
+---
+
+For our commit messages we follow the style provided by [Conventional Commits](https://conventionalcommits.org). Not all of those suggestions are appropriate for Privacy Guides, so the main ones we use are:
+
+## Commit message with correction
+
+We use `fix` for simple things like spelling mistakes or site related bugs. These things will usually have the `correction` or `bug` label on GitHub.
+
+```text
+fix: Correct spelling on XYZ page (#0000)
+```
+
+## Update to site
+
+This example is for a software removal (but could be used for an addition), you may elaborate why it was removed in the commit paragraph below. It can also be used for any new pages that were added.
+
+```text
+update: Remove foobar (#0000)
+
+Foobar was removed due to it having numerious security issues and being unmaintained.
+```
+
+## Update to specific item
+
+This example could be used for an item already on the site, but includes a minor update to the description.
+
+```text
+foobar: Add mention of security audit (#0000)
+```
+
+## Feature/enhancement
+
+For new features or enhancements to the site, e.g. where we've used the `enhancements` label it may be appropriate to signify these with:
+
+```text
+feat: Add blah blah (#0000)
+
+This change adds the forum topics to the main page
+```
+
+## Module update
+
+Dependency updates follow the normal recommendations of beginning with:
+
+```text
+chore: Bump modules/mkdocs-material from 463e535 to 621a5b8
+```