Add an optional collection home page displaying editable content

[alexklbuckley]

Is your feature request related to a problem? Please describe.

It would be nice if DSpace admin users could save and display more content about a collection and have that content be displayed on a dedicated collection home page.

Describe the solution you'd like

1. Add new metadata fields to the DSpace database for saving the following data:

• Collection header (has inner HTML)
• Collection footer (has inner HTML)
• Collection owner (has inner HTML)
• Collection introduction (has inner HTML)

2. Add a new (optional) collection home page which displays the aforementioned collection descriptive content /collections//home

• This collection home page should contain a search that only exposes items from that collection.

3. Link to the new collection home page from the sub-collection page

Describe alternatives or workarounds you've considered

You could display the new collection descriptive content fields on the collection browse page. As currently happens for the News and copyright saved for a collection.

However, having a dedicated page for displaying collection descriptive content would be nicer.

Additional information

[tdonohue]

Seems related to #3254. Similar to that, I'll add that this feature would require very careful implementation. Whenever HTML-based content can be "injected" into a page, there is a risk for XSS attacks (or similar attacks). Any implementation of this feature would need to guard against unwanted content being added into Collection pages.