Feature/updating filter

[marla-singer]

Closes #2037

[marla-singer]

@apinf/developers Ready for review

[brylie]

Rather than designing our own class, lets use the existing active class for Bootstrap buttons. E.g. simply toggle the active class when filters are active. This is semantic, consistent with other UI element on the page, and in alignment with what Bootstrap already provides.

UI showing custom class (with shadow effect)

UI showing active filters with Bootstrap native 'active' class

Rationale

In the second example, above, the UI components have a consistent look and feel. We have less code to consider and maintain, since there is one less CSS class. It may be small in terms of lines of code, but the general points are to:

• re-use what we already have
• be consistent
• look around while we develop

[marla-singer]

@brylie Done