Readme updates

[cesarvarela]

Result of this update can be seen in here: https://github.com/aiidtest/aiid/tree/chore-readme-updates/site/docs

[codecov]

Codecov Report

Attention: Patch coverage is 84.02878% with 111 lines in your changes missing coverage. Please review.

Project coverage is 96.87%. Comparing base (ad37df7) to head (27db7cb).
Report is 9 commits behind head on staging.

Files with missing lines	Patch %	Lines
site/gatsby-site/server/MongoDBAdapter.ts	74.50%	64 Missing ⚠️
site/gatsby-site/nextauth.config.ts	89.04%	16 Missing ⚠️
site/gatsby-site/src/utils/serverless.ts	90.43%	11 Missing ⚠️
site/gatsby-site/netlify/functions/auth.ts	78.04%	9 Missing ⚠️
site/gatsby-site/server/fields/common.ts	50.00%	5 Missing ⚠️
site/gatsby-site/server/context.ts	55.55%	4 Missing ⚠️
site/gatsby-site/server/tests/utils.ts	93.10%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #3202      +/-   ##
===========================================
- Coverage    97.17%   96.87%   -0.31%     
===========================================
  Files           60       66       +6     
  Lines        12334    12901     +567     
  Branches       308      372      +64     
===========================================
+ Hits         11986    12498     +512     
- Misses         334      403      +69     
+ Partials        14        0      -14     

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