AO3: Tag Hider

Add hide/show tags button to browsing pages, hide/show data button to viewing pages on AO3.

// Config
MAX_TAGS_ON_BROWSING_PAGE = 15
// When number_of_tags > 15, hide tags automatically on browsing pages.
MAX_TAGS_ON_BROWSING_PAGE = 0
// Hide tags always on browsing pages.

HIDE_WORK_DATA_AUTOMATICALLY_ON_VIEW_PAGE = true
// Hide work data automatically on viewing pages.
HIDE_WORK_DATA_AUTOMATICALLY_ON_VIEW_PAGE = false
// Do nothing on viewing pages.