embed iframe when viewing a map

[boney-bun]

fix #152

[boney-bun]

since we are using iframe, I've created a page to serve a particular map of interest accessible from the outside.
what do you think of the UI @gubuntu ?
below is the GIF.
the second illustration (http://localhost/9/embed) in the gif depicts what happened when a user embed the url to his/her site.

[codecov]

Codecov Report

Merging #313 into master-qgis_server will increase coverage by 0.03%.
The diff coverage is 83.33%.

@@                  Coverage Diff                   @@
##           master-qgis_server     #313      +/-   ##
======================================================
+ Coverage               49.07%   49.11%   +0.03%     
======================================================
  Files                     267      267              
  Lines                   20027    20050      +23     
  Branches                 2587     2589       +2     
======================================================
+ Hits                     9829     9847      +18     
- Misses                   9604     9607       +3     
- Partials                  594      596       +2

Impacted Files	Coverage Δ
geonode/maps/urls.py	94.11% <100%> (+0.78%)	⬆️
geonode/maps/qgis_server_views.py	85.48% <80.95%> (-2.33%)	⬇️
geonode/maps/views.py	47.53% <0%> (-0.4%)	⬇️
geonode/maps/tests.py	98.53% <0%> (+0.29%)	⬆️

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[lucernae]

Does this mean, there is a 'map_embed' functionality in Geoserver?

[lucernae]

Can you fix the conflict first?

[gubuntu]

LGTM (after fixing conflicts). And of course the url must be public and not localhost

[boney-bun]

@lucernae yes, embed_map has been developed for geoserver.
thanks @lucernae @gubuntu
i'm going to merge them.