chore(docs): migrate cloud docs to dotcom(1)

[littlemarcus]

Description

This PR is to merge the following docs from our Gatsby Cloud Knowledge Base to the gatsbyjs.com docs.

Links are to current Cloud Docs

1. Create a Deploy to Gatsby Cloud Button: https://support.gatsbyjs.com/hc/en-us/articles/4426768539923-Creating-a-Deploy-to-Gatsby-Cloud-Button
2. Deploying Functions on Gatsby Cloud: https://support.gatsbyjs.com/hc/en-us/articles/1500009143521-Deploying-Functions-on-Gatsby-Cloud
3. Deploying to Firebase on Gatsby Cloud: https://support.gatsbyjs.com/hc/en-us/articles/360052325114-Deploying-to-Firebase
4. Managing Workspace Members: https://support.gatsbyjs.com/hc/en-us/articles/360052324354-Managing-Workspace-Members
5. Signing Up for a New Gatsby Cloud Account: https://support.gatsbyjs.com/hc/en-us/articles/1500000666102-Signing-Up-for-a-New-Gatsby-Cloud-Account
6. Using npm 7 Peer Dependencies With Gatsby Cloud: https://support.gatsbyjs.com/hc/en-us/articles/1500009120582-Using-npm-7-peer-dependencies-with-Gatsby-Cloud
7. Build Logs: https://support.gatsbyjs.com/hc/en-us/articles/360053099173-Build-Logs
8. CMS Previews: https://support.gatsbyjs.com/hc/en-us/articles/360055676874-CMS-Previews
9. What is Gatsby Cloud: https://support.gatsbyjs.com/hc/en-us/articles/360058874874-What-is-Gatsby-Cloud-
10. Quick Connect: https://support.gatsbyjs.com/hc/en-us/articles/360061317133-Quick-Connect
11. Hosting and Data Source Integrations: https://support.gatsbyjs.com/hc/en-us/articles/1500000907821-Hosting-and-Data-Source-Integrations
12. Platform Limits: https://support.gatsbyjs.com/hc/en-us/articles/360052326714-Platform-Limits