Update site copy to match current state of the project

[bagelface]

Description 🗒️

Update site copy to be congruent with the current state of the Gnars ecosystem.

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Details 🏗️

Scrolling down from the main gnars.wtf page, you'll see a large amount of copy describing the project in moderate detail. Much of this copy is out of date and makes reference to Ethereum contracts, onchain artwork, Gnarving, etc. This copy needs to be update to be congruent with the current state of the Gnars ecosystem. Anything that is no longer relevant should be removed and anything that is outdated should be updated.

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Acceptance Criteria ☑️

1. All of the changes described in the "Details" section above are implemented and tested.
2. Code is clear, clean, and properly documented.
3. UI changes are sensible and non-regressive.