Replace Bootstrap CSS

[JG-QuarkNet]

CIMA currently includes the Bootstrap CSS library for page styling (mislabeled as 'boostrab', for some reason). This should be removed and replaced with CSS Grid or a combination of Grid and Flexbox.

There are several advantages to this:

• Grid and Flexbox are easier to read, write, and maintain
• Grid and Flexbox are more flexible and powerful than Bootstrap
• Grid and Flexbox are natively supported by all modern browsers, allowing us to eliminate the overhead of keeping and delivering Bootstrap files.
• The current Bootstrap layout looks terrible on Firefox, especially the Admin section

The WORDPOWER redevolopment branch has already implemented Grid for the index page.

[JG-QuarkNet]

After finishing the index page, the next step should be the Admin pages. Improving the Admin UI layout should be done in tandem with reviewing the Admin workflow.