v3.0.0 RC 1

[3.1.0-rc1] - 2021-08-16

Only available for Nextcloud 21/22

• [ui] #1831 - visual fixes to polls list
• [ui] #1891 - Updated vote view
• [fix] #1858 - migration error when updating from version prior to 1.8 (#1867)
• [fix] #1855 - scrolling in registration dialog on mobiles (#1860)
• [fix] #1854 - share items could be too wide, with long user names (#1859)
• [change] #1828 - hide internal user ids in public polls
• some more minor fixes, optimizations and refactoring

All changes: https://github.com/nextcloud/polls/issues?q=is%3Aclosed+milestone%3A3.1