Better tags component

[jacobobryant]

Replace that with Tagify. We're using it in The Sample:

(Tags component is used for lists and posts. Not used for sites, which support only a single tag--might change that later.)

[jacobobryant]

You can also give Tagify a list of suggested tags (see the deceptively named "whitelist" argument). Let's populate that with all of the user's tags, sorted by how often each tag is used.