Add Support for New Workspaces via New from Template

[novacbn]

Description

Should support selecting from a dropdown of available samples, with a regex validated file name input.

Initial Samples

• Default "Welcome to Svelte-In-Motion" sample.
• Simple sample showing off each built-in transition.
• Sample showing off state Store.
• Simple sample showing off each built-in filter.

[novacbn]

Iniital support was added as a command. But needs to redirect to (if at dashboard) or open new window (if on another workspace) before enabling in toolbar.

Also note, we're no longer doing file template generation. Rather generating whole workspaces from templates instead.