Update installation links for VS Code and VS Code Insiders in MCP guide

[burkeholland]

I have read the CONTRIBUTING.md file.

YES

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

The VS Code installation buttons are broken because the & and = are being unecessarily encoded.

What is the new behavior?

The links work!

Additional context

We love Supabase. 💓

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[github-actions]

Thanks for contributing to Supabase! ❤️ Our team will review your PR.

A few tips for a smoother review process:

• If you have a local version of the repo, run pnpm run format to make sure formatting checks pass.
• Once we've reviewed your PR, please don't trivially merge master (don't click Update branch if there are no merge conflicts to be fixed). This invalidates any pre-merge checks we've run.

[vercel]

@burkeholland is attempting to deploy a commit to the Supabase Team on Vercel.

A member of the Team first needs to authorize it.

[charislam]

Thanks @burkeholland!