docs: dfns new signer

[avarobinson]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

---

PR-Codex overview

Detailed summary

• Added a new page for "Dfns" in the site navigation
• Removed specific wallet signers from the "Signers" section in the introduction page and replaced them with a link to the "Choosing a Signer" page
• Updated the "Supported Signers" page to remove specific wallet signers and added a link to the "Choosing a Signer" page
• Added a new file for the Dfns integration guide
• Added code snippets for initializing and using the Dfns signer in the Dfns integration guide
• Updated the "Why Account Kit" page to remove specific wallet signers and added a link to the "Choosing a Signer" page
• Updated the code example in the "Use it with Light Account" section in the Dfns integration guide to use the createDfnsSigner function
• Added new imports and code for the Dfns signer in the snippets/dfns.ts file

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[avasisht23]

nice, just some small changes before a stamp.

can you make sure there's nowhere else they need to add themselves?

for instance, I see signers add themselves to site/smart-accounts/overview.md as well.

[avasisht23]

last few nits.

also, do you want to add them to overview.md or anything else? otherwise, feel free to ship after these last changes.

[avarobinson]

last few nits.

also, do you want to add them to overview.md or anything else? otherwise, feel free to ship after these last changes.

Don't think signers are added individually anywhere else? Don't see this in overview.md

[avasisht23]

thanks for doing this!