Add screenshots documenting editor's interaction with filters

...gures/screenshots-filter-trigger/Screenshot-abuse-log.png

...nshots-filter-trigger/Screenshot-missing-edit-summary.png

...ts-filter-trigger/Screenshot-tags-in-revision-history.png

...creenshots-filter-trigger/Screenshot-trigger-disallow.png

...hots-filter-trigger/Screenshot-trigger-warning-filter.png