performance, bundle and standardisation changes

[ovflowd]

Description

This PR does a few bundles, future-proofing, and performance improvements for the repository.

• As known, remark-gfm >= 4.0 is pretty much broken for our use-cases and some dependencies (such as next-mdx-remote). It is a given that we don't use GitHub Flavoured Markdown, except for transforming link literals into a elements (aka "auto-link literals").
  • Hence I've grabbed the autolink extension (in mdast) that remark-gfm (or more specifically micromark-util-gfm) uses.
  • This reduces the chance of us accidentally breaking our repository by updating to `remark-gfm >= 4.0) and minimizes the maintainer churn we need to keep an 👀 on that package.
  • This also drastically (somewhat) reduces the amount of bundled packages.
• This PR removes the C language and CPP language support on Shiki as it is very unlikely that we will use them and they were a big chunk of our bundle size
• This PR updates the default GitHub Actions Node.js version to v20 (LTS) and updates package.json to support Node.js >= 18.
• This PR removes non-used packages from our package.json and removes cssnano as right now we have no idea about its impact, but it does use quite a lot of space. (Or at least it has a lot of dependencies)
• We also adopted a few packages into the new Next.js v13.5 barrel file splitting, which should increase the speed of cold boot/warm boot for edge functions and Next.js bootstrap.

Validation

Builds should work as usual; Deployment should work as usual; Autolinks should still work on Blog posts.

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Name	Status	Preview	Comments	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2023 10:09am

[github-actions]

Unit Test Coverage Report

Lines	Statements	Branches	Functions
	95.19% (297/312)	77.77% (56/72)	93.75% (60/64)

Unit Test Report

Tests	Skipped	Failures	Errors	Time
31	0 💤	0 ❌	0 🔥	5.81s ⏱️

[bmuenzenmeyer]

tiny nits - otherwise happy with the bundle improvements ⚖️