Migrate from jinja2 to just plain python dictionaries

MANIFEST.in

brian_dashboard_manager/grafana/organization.py

brian_dashboard_manager/templating/eumetsat.py

brian_dashboard_manager/templating/helpers.py

brian_dashboard_manager/templating/homedashboard.py

brian_dashboard_manager/templating/render.py

...hboard_manager/templating/templates/homedashboard.json.j2

...r/templating/templates/nren_access/nren-dashboard.json.j2

...ard_manager/templating/templates/shared/dashboard.json.j2

...oard_manager/templating/templates/shared/dropdown.json.j2

...shboard_manager/templating/templates/shared/panel.json.j2

..._manager/templating/templates/shared/panel_target.json.j2

...shboard_manager/templating/templates/shared/yaxes.json.j2

requirements.txt

setup.py

test/test_update.py