fix(docs): add custom editUrl path for intro page

[dwgrossberg]

SUMMARY

Problem

At issue is a broken link on the main docs intro page (https://superset.apache.org/docs/intro). This bug was introduced after a previous PR: docs: various improvements across the docs, which removed the intro.md file from the superset/docs/docs subdirectory after deeming it redundant. This change had the unintended consequence of breaking the link for the "Edit this page on GitHub" button on the main docs/intro site page. This is because the docusaurus.config.js is currently configured to return a path of 'https://github.com/apache/superset/edit/master/docs/' + docPath. While this works fine for the other sidebar items that are still housed in the docs/docs subdirectory, it needs updating for the intro page, which is currently built from the main repo README.md file.

Solution

Add a custom editURL function to the docusaurus.config.js file so that the intro page will now properly redirect to the main repo README.md file, and the remaining sidebar links will remain unchanged.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Link Location:

Before:

After:

TESTING INSTRUCTIONS

Change the docusaurus.config.js file as suggested and check that the intro page link is working correctly. Verify that all other page links continue working as expected.

ADDITIONAL INFORMATION

• Has associated issue: Fixes Link to edit Superset /docs/intro page on GitHub is broken  #30985
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[github-actions]

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[mistercrunch]

LGTM, thank you for the contribution!

[rusackas]

Thanks for the fix! Re-running CI after fixing a small linting issue. Hopefully it passes, but nag us if it needs more attention!