Reorganize contributor docs

[mcmire]

Explanation

Most of the contributor docs are kept in one main file, but as time as gone on we have split out specific topics into their own files. Some files are not linked from the main file at all. Finally, one of the files in docs/ is intended for the core-backend repo, not the repo as a whole.

Ultimately, this is confusing for contributors.

This commit converts the main file to a table of contents, organized by category, and makes sure to link to every file in docs/. It also moves the core-backend-specific file to that package.

Note that the exact makeup of the documentation isn't perfect. We might need to rearrange some things a bit so that we have better divisions of content. There is also some duplicated content, particularly around changelogs. I'll work on that in a future PR.

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References

Related to https://consensyssoftware.atlassian.net/browse/WPC-199.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Revamps contributor documentation into a structured, discoverable layout.

• Replaces docs/contributing.md with a new docs/README.md table-of-contents and adds sectioned guides under docs/getting-started/, docs/processes/, and docs/code-guidelines/
• Updates links in README.md, PR template, scripts/create-package/README.md, and preview-build message to point to new doc paths
• Fixes/clarifies headings and intra-repo links in controller/data-service guidelines
• Adjusts .gitignore to include packages/core-backend/docs and keeps example/docs ignores
• Removes obsolete docs/contributing.md

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