CSS Trimming and Minification

[lhardt]

tl;dr

• Removed unused classes from application.css
• Created and adopted a minified version of application.css (112529 bytes , compared to the original's 235830 bytes, a ~50% reduction).
• Raised questions about OSS attribution

longer version

This PR is intended to expand on #1414 , by minifying the CSS file. Instead of minifying the CSS file directly, I preserved the original one, and created an application.min.css file. For the record, I used this minification tool.

Inspecting a little further, It also seems to me that the application.css file composed of:

• an old version of normalize.css,
• what appears to be bootstrap v2 or v3,
• many rules imported from pivotal-one-styles;
• some custom rules implemented "by hand" to satisfy business needs.

It is essentially overkill, accumulated from another project, when this login-server commit stripped away Sass from the build process and merged all CSS files into what today is application.css. Finally, it ended up here after the contents of login-served were merged into this repo.

The lack of attribution when squashing all Sass might be concerning, and is a possible license violation of the abovementioned CSS libraries. I removed a sizeable part of the "bootstrappy" code that appeared to be unused, as well as gravatar related classes, which could mitigate library risk.

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[lhardt]

I'm not sure here if I understand this line's usage correctly.

If the host provides external branding and provides their on assetBaseUrl, do we expect all the /resources/oss contents to be present there or do we expect the host to provide their own custom application.css?

A remote possibility is, if the host created their own application.css (but not a minified version) this would ensure the css file is not found.