feat: adjust styling add signup page

[kittybest]

Description

• [x] adjust theme mode to "light"
• [x] adjust light theme color set
• [x] adjust footer and header
• [x] add a signup page

Related Issue relate to #55

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Name	Status	Preview	Comments	Updated (UTC)
maci-rpgf	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 4, 2024 7:10pm

[kittybest]

Thinking it's ready to merge for the current logic. If the signup flow or other details need to be modified, then should open another PR for that.

[crisgarner]

As we are approaching the main launch of TGU and MX rounds can we merge this into a development branch and only merge to main critical fixes?

[kittybest]

As we are approaching the main launch of TGU and MX rounds can we merge this into a development branch and only merge to main critical fixes?

yes we could, since I know eth MX has already built their own frontend?