Add BleachField to contact form and model

[amakarudze]

Addresses #767.

[amakarudze]

Hey, @marksweb. Am not sure that's how django-bleach is supposed to work, just strip links and submit the form. So have converted this to a draft so I can get your input. Thanks

[codecov-commenter]

Codecov Report

Merging #793 (b62135b) into main (27b5ae5) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #793      +/-   ##
==========================================
+ Coverage   78.67%   78.74%   +0.06%     
==========================================
  Files          85       85              
  Lines        2612     2620       +8     
  Branches      251      251              
==========================================
+ Hits         2055     2063       +8     
  Misses        499      499              
  Partials       58       58              

Impacted Files	Coverage Δ
contact/forms.py	96.15% <100.00%> (+0.32%)	:arrow_up:
contact/models.py	91.17% <100.00%> (+0.26%)	:arrow_up:
djangogirls/settings.py	83.00% <100.00%> (+0.89%)	:arrow_up:

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[ramonsaraiva]

Do we still want to bleach the message field? I believe it is only missing adding that unit test check, right?

[marksweb]

@ramonsaraiva yeah I think it's still a worthwhile addition.

[ramonsaraiva]

@marksweb I added changes to the comments you've made here https://github.com/DjangoGirls/djangogirls/pull/834 - closing this draft.