Add frontend assets and plugin bundles

Add the legacy frontend themes, scripts, and plugin assets required by the main SPOTA interfaces.

assets/plugins/bootstrap-switch/CONTRIBUTING.md

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+If you want help us to fix bugs or add a extension please use our develop branch
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+https://github.com/nostalgiaz/bootstrap-switch/tree/develop
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+First step:
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+Please merge your branch develop with nostalgiaz/bootstrap-switch/tree/develop
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+second step:
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+Work in the branch develop for fixes
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+third step:
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+regularly reviews the branch develop for updates and then merge this with your branch develop
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+fourth step:
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+When you're done in your branch send us a PR to merge the two branches