**Related Ticket:** [_{link related ticket
here}_](#1127)

### Description of Changes
We already have a mechanism to parse markdown to html bts. It is highly
likely that users will try to use different markdown syntax if they see
the link syntax. So here, I made parcel resolver to compile the
cookieconsent form to html beforehand. I only did it for copy, but some
questions are
- does title also accept markdown?
- should we have some kinds of prefixes to note that this is a markdown?
(we use ::markdown prefix for mdx files, but this is configuration so it
can be a bit different story.

when close button is pressed

…when close btn is pressed (#1165)

I removed some styles that are not necessary for cookieconsent. I will
put my reasoning with inline comments.

(Lots of changes are nitpicks, but I thought it might be a good
opportunity to onboard you on some practices that are not well
documented)