Manifesto implementation

[wackerow]

With SIWE wallet integration setup, we need the Manifesto page setup for users to be able to digitally sign the manifesto.

• Import Manifesto - Options here include importing a .md file of the Manifesto into repo, importing from Arweave, or importing from GitHub User Content.
• Setup a message for user to sign which includes the hash of the manifesto content.
  Note that the GitHub version is markdown and links to Arweave, and the Arweave path is actually html containing a link back to the GitHub version in the html header...

...so I'm not sure what hash we want to use exactly. I would advocate for using the sha256 hash of the _markdown_ file from GitHub exactly as it is, including the thank you at the top and the Arweave link at the bottom (so if that link ever changes, so will the hash of the manifesto).

• Display Manifesto on the /manifesto page, including signing and sharing button

Note on design screenshot from Figma, we should consider using the same button theming that we're using elsewhere on the site instead of what is shown in the Figma. This was from the original hypersprint.

• Wire up signing button to sign the message
• Save signature... @jonathanprozzi Remind me, do we know where we're planning to store these?
• Wire up share on Twitter button

[oovg]

• Display table of signers below the 'Sign the Manifesto' section.

Edit: will add a design img for layout