docs: streamline CONTRIBUTING.md and add DEVELOPMENT.md

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes Docs: Audit and streamline CONTRIBUTING.md #5120
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Makes CONTRIBUTING.md much more compact by:

• Trimming language in many places
• Removing duplicate pleas for good behavior
• Removing pleas for good behavior that have since become enforced by CI tooling (or reducing them to references to the tooling)
• Splitting out development-specific information into a new dedicated DEVELOPMENT.md
• Uses the "Do: ..." and/or "Don't: ..." format for concise lists where possible

Builds on the good changes contributed by @santoshyadavdev in #5595. 🚀

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 47 targets

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[bradzacher]

this is looking really good so far! A few comments

[codecov]

Codecov Report

Merging #5715 (9c6b37c) into main (f373fac) will not change coverage.
The diff coverage is n/a.

❗ Current head 9c6b37c differs from pull request most recent head b6859ac. Consider uploading reports for the commit b6859ac to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5715   +/-   ##
=======================================
  Coverage   93.82%   93.82%           
=======================================
  Files         134      134           
  Lines        1506     1506           
  Branches      226      226           
=======================================
  Hits         1413     1413           
  Misses         60       60           
  Partials       33       33           

Flag	Coverage Δ
unittest	93.82% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/scope-manager/src/scope/ScopeBase.ts	91.46% <0.00%> (ø)
packages/scope-manager/src/referencer/Reference.ts	88.00% <0.00%> (ø)
...ackages/scope-manager/src/variable/VariableBase.ts	100.00% <0.00%> (ø)
...ges/scope-manager/src/definition/DefinitionBase.ts	100.00% <0.00%> (ø)