deafult path for worktrees

[cova-fe]

Is your feature request related to a problem? Please describe. When I create a new worktree, I'm asked to specify a path; this could be cumbersome to remember and to insert (like ../../xxx)

Describe the solution you'd like A configuration item with the default worktrees path and a variable to be added to the path, like "Worktree default path: ../../%{repo}-1" to be pre-filled in the form field when creating the new worktree

Describe alternatives you've considered I considered to write that by myself, however I'm new to golang and even considering the tutorials for newbie my solution will likely too ugly and not good enough :)