Migrate website to no longer require registration/payments

[coderberry]

• [ ] Remove pricing section
• [ ] Remove "Get all access" links
• [ ] The "Sign In" links could be removed once the premium components are made accessible to everyone.
• [ ] Remove the 🔒 icons next to premium components in the menu
• [ ] The pages of premium components can be removed once those components are available on the site without logging in.
• [ ] Replace "Coming soon" with "Planned".