Extension directory: Display "Installable through CiviCRM's user interface?" value on extension page
More than once, I've rather stupidly spent time wondering why an extension which has a new release listed on c.o doesn't show a "new version available" message in the in-app Extensions listing in CiviCRM, only to figure out through some roundabout way that the extension is not "Installable through CiviCRM's user interface".
It would be quite nice to see this plainly on the c.o extension page, perhaps in the area that's currently a gray sidebar, e.g. this section from https://civicrm.org/extensions/symbiotic :
This is also relevant because at the bottom of every such page there's a link to Learn more about installing CiviCRM extensions, where the section on Installing begins by telling users to "Go to Administer > System Settings > Extensions."