refactor(main): Replace `echasnovski` with `nvim-mini`

[Uzaaft]

@mehalter need a review from you. Blocked on Astronvim/astronvim#2822

[github-actions[bot]]

Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• [ ] Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• [ ] README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• [ ] Entry returns a single plugin spec with the new plugin as the only top level spec (not applicable for recipes or packs).

• [ ] Proper usage of opts table rather than setting things up with the config function.

• [ ] Proper usage of specs table for all specs that are not dependencies of a given plugin (not applicable for recipes or packs).

[mehalter]

This shouldn't happen until AstroNvim v6