Close #24808 Co-Authour @wxiaoguang @silverwind 1. Most svgs are found from https://worldvectorlogo.com/ , and some are from conversion of png to svg. (facebook and nextcloud). And also changed `templates/user/settings/security/accountlinks.tmpl`. 2. Fixed display name and iconurl related logic # After <img width="1436" alt="Screen Shot 2023-06-05 at 14 09 05" src="https://github.com/go-gitea/gitea/assets/17645053/a5db39d8-1ab0-4676-82a4-fba60a1d1f84"> On mobile <img width="378" alt="Screen Shot 2023-06-05 at 14 09 46" src="https://github.com/go-gitea/gitea/assets/17645053/71d0f51b-baac-4f48-8ca2-ae0e013bd62e"> user/settings/security/accountlinks (The dropdown might be improved later) <img width="973" alt="Screen Shot 2023-06-01 at 10 01 44" src="https://github.com/go-gitea/gitea/assets/17645053/27010e7e-2785-4fc5-8c49-b06621898f37"> --------- Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
