Update the docs to reflect the newest changes

[Cryt1c]

• Update Getting Started
• Update Data Producers
• Update Queries
• Update Mutations
• Update Advanced

[Cryt1c]

I think we can already merge this first update so that the "Getting started" part is up to date again. The rest will follow.

[codecov]

Codecov Report

Merging #839 into 8.x-4.x will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             8.x-4.x     #839   +/-   ##
==========================================
  Coverage      68.81%   68.81%           
  Complexity       518      518           
==========================================
  Files             87       87           
  Lines           1193     1193           
==========================================
  Hits             821      821           
  Misses           372      372

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[fubhy]

Sweet thanks!