Docs: migration guides for new package versions

[lukegalbraithrussell]

Summary

previews:

• changelog entry (this is in the docs repo)
• migration overview page
• web-api migration guide
• webhook migration guide
• socket-mode migration guide

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[changeset-bot]

⚠️ No Changeset found

Latest commit: ffdb4af

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.98%. Comparing base (1005227) to head (ffdb4af).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##               v8    #2606   +/-   ##
=======================================
  Coverage   88.98%   88.98%           
=======================================
  Files          62       62           
  Lines       10118    10118           
  Branches      458      458           
=======================================
  Hits         9003     9003           
  Misses       1091     1091           
  Partials       24       24           

Flag	Coverage Δ
cli-hooks	88.98% <ø> (ø)
cli-test	88.98% <ø> (ø)
logger	88.98% <ø> (ø)
oauth	88.98% <ø> (ø)
socket-mode	88.98% <ø> (ø)
web-api	88.98% <ø> (ø)
webhook	88.98% <ø> (ø)

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[WilliamBergamin]

Nice work 🥇 left a few comments mainly about remove some stuff 🙏

Maybe we should merge this branch in the v8 instead of main that was we can merge everything at the same time 🤔 at the same time there might be a delay between merging and releasing

[lukegalbraithrussell]

@WilliamBergamin addressed all your feedback! (removed the stuff that should be removed, and swapped Option A and Option B for each)

[WilliamBergamin]

Thanks for addressing all my feedback 🙏

[WilliamBergamin]

Is the link to [web-api v8 migration guide](./web-api-v8-migration.md) valid?