Refactors some of the vim bindings to make the vim.json file less
obtuse.

Release Notes:

- vim: add `;` and `,` to repeat last `{f,F,t,T}`
- vim: add zed-specific shortcuts for common IDE actions:
- - `g A` to find all references
- - `g .` to open the code actions menu.
- - `c d` for rename