Refactor code for marketing rebrand

[hexagoncircle]

A much needed marketing facelift to the site.

• Adds new font displays
• Refactors home page
• Adds pricing page
• Converts /faq to /about and cleans up prose
• Phase 1 refactor of product UI
• Fixes https://github.com/frankmarra/DLCM/issues/76

Todo

• [x] Work on logged in product UI
• [x] When logging in from /login page, the user should be redirected to their dashboard
• [x] Subsequent visits to the /login page should redirect them to dashboard
• [x] Need to refactor slug.js so that 404 and 500 error pages actually work properly
• [x] Update OG image and favicon to reflect new branding
• [x] Update default "DLCM" image to reflect new branding

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[hexagoncircle]

@frankmarra I think this is ready to merge! Give it a final review when you have a moment 🎸