Update certificate management page consistency

This change applies global styles to improve
page layout consistency and modal management

- Adds page and section styles
- Rem

Update certificate management page consistency

This change applies global styles to improve
page layout consistency and modal management

- Adds page and section styles
- Removes unused styles
- Creates individual html files for modals
- Updates certificate modals to bootstrap modal
- Updates global styles for input file field in file-upload.scss

TODO:
- Update certificate table with table component in separate commit
- Update CSR modal to use global form-field styles in separate commit

Signed-off-by: Dixsie Wolmers <dixsiew@gmail.com>
Change-Id: I9b800cb684740da1a9168294433e726efb0f9d0e

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