Web editor guide

[ethanpalm]

Documentation changes

This PR updates https://mintlify.com/docs/editor to help people less familiar with Git start using the web editor while learning a docs-as-code workflow.

Summary of changes:

• Reorganize the article so that it introduces the general workflow, then explains the Git concepts happening behind the scenes so that the abstraction of the editor isn't mysterious. This focuses on value for the user (what the web editor automates) and responding directly to common questions (when to use branches)
• Then the article progresses through the editor flow
  • Creating a branch
  • Making changes
  • Creating PRs, reviewing, merging
  • Troubleshooting
• Adds info on common tasks
  • How to create pages
  • Example of updating navigation

Closes https://linear.app/mintlify/issue/DOC-69/web-editor-docs

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

[baell]

Left nits but good to go