[i18nIgnore] Migrate to Content Collections

[bholmesdev]

What kind of changes does this PR include?

• Changes to the docs site code

Description

• Migrate all docs pages to a docs collection under /src/content/docs/. This preserves the existing i18n folder structure, unchanged.
• Enforce schemas for different docs layouts based on a new type frontmatter param. This type replaces the layout param, and can be omitted when using the MainLayout. These types can be found browsing the schemas under src/content/config.ts. I'm curious if the docs team has ideas for CONTRIBUTING updates or further refactors here!

---
- layout: ~/layouts/DeployGuideLayout.astro
+ type: deploy
---

• Update navigation mappers, open graph utilities, and other uses of glob to use getCollection.
• Update the [lang]/[...slug].astro to render content collection entries. This also allowed for fallbacks and page routes to be generated in the same place. This also maps the type frontmatter param to the correct layout.
• Add type safety to layout and head props.
• Add a new splitSlugFromLang util. This helps with parsing the language out of the generated content collection slug.
• Rename redirect slug routes to [...enRedirectSlug] and [enBaseLevelRedirectSlug]. This was purely for readability debugging our new slug generation routes. I'll differ to @delucis for changing this naming back.

Chores

• Bump Astro core to 2.0, and peer packages to their respective majors
• Update markdown config to use new gfm and smartypants flags

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[sarah11918]

Confirming that I have tested/looked for (large screen size):
Tutorial: check boxes, multiple choice quizzes, confetti
Components: package manager tabs (including selecting one affecting all on the page), Since (new added in), Right sidebar tracking
Alt Layouts: tutorial, deploy, migrate, CMS
Different languages: navigated in pl and pt-Br

[yanthomasdev]

I had checked this PR before the optimizations and everything was working properly, and again I'm here to confirm everything looks great!

What I tested:

• Are components working? (Since, Badge, Version, Tabs, Algolia, Dev-only warning, etc) ✔️
• Are all pages and their subpages being rendered? (Integrations, Error Reference, 404...) ✔️
• Are our translations there, working as intended? (Language Selector, Fallback, "EN", etc) ✔️
• No layout bugs or malfunctioning mobile features? ✔️

[sarah11918]

is updating our contributor/translator guide a pre-req to merging this? Should we have that available first, @delucis @Yan-Thomas ?

[yanthomasdev]

is updating our contributor/translator guide a pre-req to merging this? Should we have that available first, @delucis @Yan-Thomas ?

I believe @delucis made all the necessary changes to these, couldn't find anywhere else in our .md guides where we mention src/pages rather than src/content, so we should be good to go!

[sarah11918]

DOES THIS MEAN I APPROVE????

[sarah11918]

I have not found any reason not to approve this...

Great work @delucis & @bholmesdev !

Let's ... NOT do this again soon?? 😅