chore: Remove developing/introduction page and make Local Development the landing page

[mintlify]

Removed the introduction page from the developing section and made Local Development the direct landing page for the /developing/ tab. This streamlines the navigation by eliminating an unnecessary intermediate page.

Files changed:

• docs/mint.json - Updated navigation to remove developing/introduction
• docs/developing/introduction.mdx - Deleted file

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Created by Mintlify agent

[github-actions]

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No release type found in pull request title "Remove developing/introduction page and make Local Development the landing page". Add a prefix to indicate what kind of release this pull request corresponds to. For reference, see https://www.conventionalcommits.org/

Available types:
 - feat: A new feature
 - fix: A bug fix
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 - style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
 - refactor: A code change that neither fixes a bug nor adds a feature
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 - chore: Other changes that don't modify src or test files
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[cubic-dev-ai]

No issues found across 2 files