Removed ``Testbeds`` fields from ``Hubs``.

https://github.com/madewithbytes/us_ignite/issues/294

The fields that belong to a ``Testbed`` were removed
from the ``Hub`` model.

These fields will be reimplemented in the ``testbed`` app.
Removed non-existent fields from the search.

https://github.com/madewithbytes/us_ignite/issues/294
Removed non-existent hub fields from the admin.
Removed non-existent hub fields from dummy generation.
Bugfix: Make sure the Hubs preserve the saved image.
Removed non-existent hub field from the map json.
Remove non-used hub initial fixtures command loader.
Update Hub field to reflect new fields.
Avoid loading non-existent hub fixtures.
Add initial definition for the ``testbeds``.

https://github.com/madewithbytes/us_ignite/issues/294
Enable ``testbeds`` app.
Relocate dict generator for the locations.
Use relocate dict generator for the hubs locations.
Add command to load initial testbeds fixtures.
Use contact as the trigger to show the contact form.
Cosmetic: Removed whitespace in the template.
Cosmetic: Remove unused block in the hub list template.
Add views to detail/list the ``testbeds``.

https://github.com/madewithbytes/us_ignite/issues/294
Hook the testbeds to the community menu.

https://github.com/madewithbytes/us_ignite/issues/294
Generate dummy content for the ``testbeds``.

https://github.com/madewithbytes/us_ignite/issues/294