Add styles to qgs file

[boney-bun]

the end result will be similar to the abandon #472

fix #406 fix #325

[boney-bun]

@lucernae the unittest will come later as i'm still struggling to make it passed

[codecov[bot]]

Codecov Report

Merging #474 into 2.8.x-qgis_server will increase coverage by 0.01%. The diff coverage is 76.92%.

@@                  Coverage Diff                  @@
##           2.8.x-qgis_server     #474      +/-   ##
=====================================================
+ Coverage              41.36%   41.37%   +0.01%     
=====================================================
  Files                    403      403              
  Lines                  28950    28968      +18     
  Branches                3671     3678       +7     
=====================================================
+ Hits                   11974    11986      +12     
- Misses                 16234    16236       +2     
- Partials                 742      746       +4

Impacted Files	Coverage Δ
geonode/qgis_server/signals.py	83.26% <71.42%> (-0.69%)	:arrow_down:
geonode/qgis_server/helpers.py	66.31% <83.33%> (-0.18%)	:arrow_down:

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[gubuntu]

merge and deploy asap @boney-bun so we can test

[boney-bun]

thanks @lucernae i'm going to merge this