Improve storage

[edlerd]

Done

• address various issues around storage creation/editing discovered during in person review. Notes are in this doc
• improve link from storage pool detail page to volumes, make it part of the tabs
• change storage volume filter state, to be persisted in the url, so it can be bookmarked, shared and linked to
• make content type immutable on storage volume edit form
• make size immutable on storage volume edit form, when the volume is not of type custom
• improve help text for disabled storage volume delete button, to hint the user how to remove this storage volume.

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @lorumic or @edlerd for access.
   • With a local copy of this branch, run as described here.
2. Perform the following QA steps:
   • test storage pool detail page: link to volumes from tab list
   • test filters on storage volume list in url, reload, linking to it and changing filters should work as expected
   • edit a storage volume, ensure size and content type are immutable as described above in the "done" section
   • check the storage volume delete buttons help text from the storage volume list.

[webteam-app]

Demo starting at https://lxd-ui-535.demos.haus

[lorumic]

All good, just one minor suggestion.

[edlerd]

Change the way storage volume content-type and volume-type are displayed throughout the app: With capitalized first letter, and say VM instead of virtual-machine.