feat(content): introduce build-time rendering/highlighting for markdown

[brandonroberts]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/analogjs/analog/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Which package are you modifying?

• vite-plugin-angular
• vite-plugin-nitro
• vitest-angular
• astro-angular
• create-analog
• router
• platform
• content
• nx-plugin
• trpc

What is the current behavior?

Shiki syntax highlighting is done at build time and runtime. This causes the full shiki package to be included, producing many lazy loaded chunks.

Closes #1132

What is the new behavior?

• All markdown rendering and syntax highlighting is done at build time through a Vite plugin. No rendering/highlighting code is shipped to the client.
• All client rendering/highlighting code is removed
• Some rendering code for using transfer state for content headings is retained

Does this PR introduce a breaking change?

• Yes
• No

Other information

[optional] What gif best describes this PR or how it makes you feel?

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