Evaluate plugins to improve writing

[mrolli]

Is your feature request related to a current shortcoming? Please describe.
There are some interesting plugins regarding writing. These plugins can help to
improve the language by making suggestions.

Describe the solution you'd like
Checkout and play with the following plugins that are available as null-ls
builtins:

• proselint
• write-good
• alex

Also investigate why these are both installed by Mason as linters but
additionally setup a null-ls bultins.