chore: add migration section

[joebochill]

Changes proposed in this Pull Request:

• Add a small migration section for the last major version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.67%. Comparing base (921794f) to head (b589a02).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #678   +/-   ##
=======================================
  Coverage   72.67%   72.67%           
=======================================
  Files          89       89           
  Lines        1127     1127           
  Branches      246      246           
=======================================
  Hits          819      819           
  Misses        131      131           
  Partials      177      177           

Flag	Coverage Δ
unittests	72.67% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Visit the preview URL for this PR (updated for commit b589a02):

https://blui-react-login--pr678-chore-readme-update-460vvkb5.web.app

_{(expires Thu, 12 Dec 2024 15:09:36 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 1e9064d2e35ed37fe01e053587ea5f209719a043}