Add tags for Demos and Deprecated components

[mcarrano]

For PatternFly 5, we will combine Demos and Components into a single section on the website, but want a way to tag items in the navigation and/or page heading to indicate is they are a demo. Similarly, want to be able to tag deprecated components.

See Org issues: patternfly/patternfly-org#3370 and patternfly/patternfly-org#3371

cc @evwilkin

[lboehling]

Designs can be found here: https://www.sketch.com/s/66bb846a-6d69-45c2-922b-e58667563549