Documentation for v5

[elia]

Summary

• Includes documentation for https://github.com/solidusio/solidus_stripe/pull/295.
• Fixes #208
• Closes #293

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• [ ] I have written a thorough PR description.
• [ ] I have kept my commits small and atomic.
• [ ] I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov[bot]]

Codecov Report

Merging #301 (fca328a) into main (4bcc604) will not change coverage. The diff coverage is n/a.

:exclamation: Current head fca328a differs from pull request most recent head 6c8847e. Consider uploading reports for the commit 6c8847e to get more accurate results

@@           Coverage Diff           @@
##             main     #301   +/-   ##
=======================================
  Coverage   99.63%   99.63%           
=======================================
  Files          30       30           
  Lines         546      546           
=======================================
  Hits          544      544           
  Misses          2        2           

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