Update `index.md` for Pantheon recipe

[ccharlton]

Minor tweaks and a few little additions.

Bare minimum self-checks

What do you think of a person who only does the bare minimum?

• [X] I've updated this PR with the latest code from main
• [ ] I've done a cursory QA pass of my code locally
• [ ] I've ensured all automated status check and tests pass
• [ ] I've connected this PR to an issue

Pieces of flare

No applicable flare??

• [ ] I've written a unit or functional test for my code
• [ ] I've updated relevant documentation it my code changes it
• [ ] I've updated this repo's README if my code changes it
• [ ] I've updated this repo's CHANGELOG with my change unless its a trivial change (like updating a typo in the docs)

Finally

• [ ] I've requested a review with relevant people

If you have any issues or need help please join the #contributors channel in the Lando slack and someone will gladly help you out!

You can also check out the coder guide.

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