docs: Update connect wallet docs

[cpcramer]

What changed? Why? Update Wallet docs.

• Update the wallet page to include the updated code and components. This includes new example code, component definitions, and demo wallet button.
• Update the landing page to include the updated code and demo wallet button.
• Remove wallet/introduction page to be more consistent with the Swap component documentation.
• Remove deprecated wallet/connect-account page Notes to reviewers

How has it been tested? Landing page:

wallet/wallet:

Sidebar: