Adds RainbowKit to Integrations > Wallets

[dawnkelly09]

Description

This guide introduces RainbowKit and instructs the user on how to integrate Moonbeam support using the prebuilt app scaffolding or the manual build for a more custom integration

Checklist

• [ x] I have added a label to this PR 🏷️
• [ x] I have run my changes through Grammarly
• [x ] If this page requires a disclaimer, I have added one

Corresponding PRs

None

After Translation Requirements

• [ ] Will need to create PR in moonbeam-docs repo to remove images
• [ ] Will need to create PR in moonbeam-docs repo to remove variables
• [ ] Will need to create PR in moonbeam-mkdocs repo to add redirects for Chinese site
• [ ] No additional PRs are required after the translations are done

Items to be Updated

Please list any of the items that will need to be added or deleted after the translations are done here.