.button-none and .link-none improvements

`.button-none` should have `text-align: left`
`.button-none` should have no `:hover` styling
`.button-none` should be `.button-unstyled` or something clearer?

And any other similar changes.

`.link-none` would be created to not show underline on `:hover` and etc. Handy for when an anchor tag is wrapping something like a button.

Start by locating the Sass definitions for `.button-none` and related button and link selectors, then inspect their current hover and text-alignment rules. Confirm the intended replacement name and identify any similar selectors that need the same treatment; done means the agreed button and link styles behave correctly without unwanted hover decoration.

Written by the indexing model from the issue text.