Idea: Add version of app to template

[c-git]

Is it desirable to add a small about page to the template? I tend to overlook doing this but when I'm debugging I always remember I should have so I can see what version is running. If I'm not the only person an about page would help maybe it makes sense to add to the template now that we have modal support?

PS. I need it anyway for myself so I don't mind doing the PR just don't want to waste time on the PR if no one other than me wants it (I can just keep it as a code snippet for myself). Will try to keep it simple and generic so it pulls the info from the Cargo.toml

[c-git]

Alternative idea is to just add the version number to the heading that already exists.

Example of alternate approach: c-git/log-viewer@326bea5