Migrating the JULES Trac wiki pages to GitHub

A subset of the JULES Trac wiki pages need to be migrated to the JULES GitHub pages. This issue will help document these and identify where the content should go. The list so far:

- [x] Release schedule and links to release notes & docs
- [x] JULES mailing list sign up instructions (https://code.metoffice.gov.uk/trac/jules#MailingListsGitHubDiscussions)
- [ ] Upgrading a JULES Rose suite (https://code.metoffice.gov.uk/trac/jules/wiki/JULESWithRose#UpgradingaJULESRosesuite)
- [x] Working Practices for JULES development (https://code.metoffice.gov.uk/trac/jules/wiki/WorkingPractices?version=98)
- [x] Sharing JULES metadata (https://code.metoffice.gov.uk/trac/jules/wiki/SharingJULESmetadata)
- [ ] Redesigning JULES tile input (https://code.metoffice.gov.uk/trac/jules/wiki/JULESTileInputRedesign)
- [x] Link to https://jules.jchmr.org/about
- [x] Link to JULES tutorials (although these will need updating https://jules-lsm.github.io/tutorial/bg_info/tutorial_julesrose/index.html - who owns these?)