Added docs and examples for scrollview and section

[js-goupil]

Background

This adds documentation and examples for both ScrollView and Section.

Solution

(Describe your solution, why this approach was chosen, and what the alternatives/impacts may be)

🎩

Copy and paste the code samples and make sure they look good!

Tophat links:

Section: https://shopify-dev.ui-extensions-7t4u.jeansebastien-goupil.us.spin.dev/docs/api/pos-ui-extensions/unstable/components/section

ScrollView: https://shopify-dev.ui-extensions-7t4u.jeansebastien-goupil.us.spin.dev/docs/api/pos-ui-extensions/unstable/components/scrollview

Checklist

• [ ] I have :tophat:'d these changes
• [ ] I have updated relevant documentation

[github-actions[bot]]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset directory. If the changes are user-facing and should cause a version bump, run yarn changeset to track your changes and include them in the next release CHANGELOG. If you are making simple updates to repo configuration, examples, or documentation, you do not need to add a changeset.

[js-goupil]

@vctrchu Yeah it's more because I got tired of copy pasting across files and having to rename it each time lol. I'm gonna keep it like this for a faster workflow 😄