Ability to select different value for page's title tag

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The Digital Accessibility Strategy Lead on our team suggested the addition of a mass.gov page field that lets the content entry user enter a shorted/customized version of the descriptive portion of the page title. This could be programmatically done to just isolate the the first portion of the title tag, with the website name automatically appended afterwards. They could code it in such a way that if that custom title tag field is left blank, then whatever visible page title was entered for the page is used. This would help with pages that have longer page titles that are difficult to shorten, so the actual page title does not need to be shortened, but a shortened title tag can appear in browser and is not cut off.

Start by locating the page content-entry model and the code that renders the page title tag. Check how the visible page title and website name are currently combined, then determine where an optional shortened title would be stored and applied. Done means a blank custom value falls back to the visible title, while a supplied value is used in the title tag without changing the visible page title.

Written by the indexing model from the issue text.