Move documentation into the django context

[jmsmkn]

This is required for rendering the built documentation in
our application.

[codecov]

Codecov Report

Merging #2029 (747920a) into master (de4041c) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2029   +/-   ##
=======================================
  Coverage   93.44%   93.44%           
=======================================
  Files         688      688           
  Lines       26287    26287           
=======================================
+ Hits        24563    24564    +1     
+ Misses       1724     1723    -1     

Impacted Files	Coverage Δ
app/grandchallenge/components/models.py	93.17% <0.00%> (+0.29%)	⬆️

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