fix links, whitespace

[purplecabbage]

Description

get-access -> ../get_started/app_builder_get_started/set-up.md#access

This PR updates documentation links and list formatting for clarity and consistency in various markdown files.

In requirements.md, an obsolete link reference is removed.
In extension-migration-guide.md, the ordered list items have been reformatted for clarity.
In first-app.md, the link to accessing App Builder has been updated to reflect the new file structure.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[louisachu]

getting_started/first-app.md is not being used in this repo.
There is a src/pages/config.md is converted from the gatsby-config file. I'm not sure why but it seems the one you maybe thinking of is get_started/app_builder_get_started/first-app.md to modify this. Please check against those file.
Also because we do not have a local environment at this moment, I've deployed your files into stage so we can view it to make sure it works properly. https://developer-stage.adobe.com/app-builder/docs/get_started/ I've verified all your changes are good except the first-app.md file.

[Copilot]

Pull Request Overview

This pull request updates various Markdown documentation files to correct links and improve formatting consistency.

• Removes obsolete link references in requirements.md
• Reformats ordered list items in the extension migration guide
• Updates and fixes hook link in configuration.md
• Deletes first-app.md (verify if removal was intended)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/pages/resources/custom-asset-compute-worker/requirements.md	Removed two obsolete link reference definitions
src/pages/guides/app_builder_guides/extensions/extension-migration-guide.md	Reformatted list numbering and clarified descriptions
src/pages/guides/app_builder_guides/configuration/configuration.md	Updated hook link target and formatting
src/pages/getting_started/first-app.md	Entire file deleted—confirm if this was intended

Comments suppressed due to low confidence (2)

src/pages/guides/app_builder_guides/configuration/configuration.md:229

• The list item marker (- ) was removed, which breaks the Markdown list structure. Please restore the leading - bullet or proper indentation to keep this as part of the list.

Hooks can be used to customize `aio app` commands, as documented [hooks](../architecture_overview/app-hooks.md)

[purplecabbage]

getting_started/first-app.md is not being used in this repo.

Thanks, I thought it was kinda dumb to have a getting_started/ and get_started/