BB-834: Fix simple-theme deployments
This PR fixes a lot of styling errors and improves readability for simple-theme deployments on Ocim.
Testing instructions: Note: These changes are deployed to Ocim stage.
- Use Ocim stage to deploy an instance using the beta testing application form and this configuration branch.
- Check if the theme is correctly deployed in the appserver.
I already done this with 2 sets of colors, so you can check the result at: Light colors: https://stage.console.opencraft.com/instance/3230/edx-appserver/1022/ Darker colors: https://stage.console.opencraft.com/instance/3230/edx-appserver/1020/
Reviewers:
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@lgp171188