H-600, H-618, H-91: Add `hash.dev/docs` section

[vilkinsons]

🌟 What is the purpose of this PR?

Hold fire on merging this until the HASH app is ready for use publicly.

Adds the new hash.dev/docs microsite with information for developers wanting to self-host and use HASH. This PR makes use of the approach from the BP site for generating the docs page sitemap, and implements components based on the existing ones in the BP site (for example the Sidebar and PageNavLinks components).

Remaining TODOs:

• [ ] Add missing content to docs pages
• [ ] Link the use-cases on the docs home page (and elsewhere in the site) to the corresponding docs pages (once they exist)
• [ ] Add appropriate forms where we mention 'filling in email' in the content

🔍 What does this change?

• adds script that generates a sitemap.json file, which contains a sitemap with the nested docs pages which are made available to components through react context
• adds custom dev and build scripts which ensure the sitemap.json has been generated
• converts the Next.js app to an ESM module
• updates the navbar and mobile navbar to get the site's pages from the sitemap
• adds the /docs home page, and docs pages based on the implementation of the BP site
• Add InfoCard and InfoCardWrapper MDX components

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• [x] does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• [x] are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• [x] do not affect the execution graph

⚠️ Known issues

🐾 Next steps

🛡 What tests cover this?

None

❓ How to test this?

View the deployment and go visit the /docs page.

📹 Demo

https://github.com/hashintel/hash/assets/42802102/75f5c283-608e-4920-82dc-cb2ce760e166

[linear[bot]]

H-94

[vilkinsons]

@benwerner01 Where a subtitle is provided in MDX topmatter it’s currently showing up in the sidebar as a link. We can remove it from here, as this is unnecessary (we already show the title and this is not a separate section per se, just a provider of additional context about the same thing).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 27.53%. Comparing base (fd4d46f) to head (e00ba3c). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2768   +/-   ##
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  Coverage   27.52%   27.53%           
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  Files         278      278           
  Lines       11613    11609    -4     
  Branches     1177     1174    -3     
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  Hits         3196     3196           
+ Misses       8401     8397    -4     
  Partials       16       16           

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[vilkinsons]

✅ 1 of 2 🚀