Use astro-orbit

[jakebellacera]

As part of getting rid of delta-theme and simplifying the website structure, we need to replace the underpinnings of our theme with astro-orbit. This does away with having to import tailwind directly into the site. This essentially left the delta-theme package as a glorified collection of components, so I decided to just get rid of the delta-theme package entirely.

Summary of changes:

• Followed up with a couple of leftover changes from Use astro-config #568 to move astro-favicons out of delta-theme components.
• Moved remarkPlugins to delta-site.
• Installed astro-orbit in delta-site and cleaned up tailwind configuration.
• Removed the delta-theme package.

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