#2095 Include page counts on subject browse

[symmetrically]

Closes #2095

[benwbrum]

The UI for this looks very good, but the performance is too slow for large projects.

If I log in as owner petelin then visit http://localhost:3000/cwrgm/cwrgm-rev2/subjects the page takes five minutes to load; most of which is spent executing SQL queries to find the page count for each subject.

Completed 200 OK in 318310ms (Views: 267481.2ms | ActiveRecord: 48510.1ms | Allocations: 104765563)

[benwbrum]

Functionality and performance are great. Could we modify the UI so that the number of pages is displayed next to the subject, in parentheses, but still in the grey color?

[benwbrum]

Let's abandon the column spacing and add the parenthetical page counts directly after the subject titles.

[symmetrically]

@benwbrum If we abandon the column spacing, Then, it will look weird in context of UI because the Subject titles can be varied in length. Look at below screenshot.

As we are using that span in Link_to of subject title

[saracarl]

Dropping in 2 screenshots of the earlier layout for comparison.

[saracarl]

@symmetrically could we do the link_to inside the span, with the page count immediately afterwards with only a space separating it?
Like this, more or less:

Newspapers (80)

[saracarl]

See earlier UI comments.