implement CRUD commands for links/aliases

- [ ] rename `list` to `links`

introduce sub commands for `links`
- [ ] `add`  to create an alias `usage: cliq links add alias url`
- [ ] `edit`  to edit an alias `usage: cliq links edit alias updated-url`
- [ ] `rm` to delete an alias `usage: cliq links rm alias`
- [ ] `mv` to rename an alias `usage cliq links mv old_alias new_alias`