Use inline CSS with a nonce and move CSP headers to a meta tag.

Allow hyphens css property to work correctly and improve screen readers.

This fix avoid breaking Unicode string. 

It solves this error:

pq: invalid byte sequence for encoding "UTF8": 0xf0 0x9f 0x9a 0x2e

Bumps [github.com/tdewolff/minify/v2](https://github.com/tdewolff/minify) from 2.9.16 to 2.9.17.
- [Release notes](https://github.com/tdewolff/minify/releases)
- [Commits](https://github.com/tdewolff/minify/compare/v2.9.16...v2.9.17

)

Signed-off-by: dependabot[bot] <support@github.com>

No issue

This is already stored and updated in the DB to render the History page but is currently not exposed through the API

If the application is hosted behind a CDN like Cloudflare,
then all custom stylesheets is be the same for all users.

The random query string prevent the CDN to cache this.

Bumps [github.com/lib/pq](https://github.com/lib/pq) from 1.10.1 to 1.10.2.
- [Release notes](https://github.com/lib/pq/releases)
- [Commits](https://github.com/lib/pq/compare/v1.10.1...v1.10.2

)

Signed-off-by: dependabot[bot] <support@github.com>

Regression introduced in commit 51fb9495.

the number of feeds in the category is currently displayed twice, and a lot less
useful than the number of unread items in the category.

Bumps [github.com/lib/pq](https://github.com/lib/pq) from 1.10.0 to 1.10.1.
- [Release notes](https://github.com/lib/pq/releases)
- [Commits](https://github.com/lib/pq/compare/v1.10.0...v1.10.1

)

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [github.com/tdewolff/minify/v2](https://github.com/tdewolff/minify) from 2.9.15 to 2.9.16.
- [Release notes](https://github.com/tdewolff/minify/releases)
- [Commits](https://github.com/tdewolff/minify/compare/v2.9.15...v2.9.16

)

Signed-off-by: dependabot[bot] <support@github.com>

The contrast between background and purple for visited links was too
low (1.69). Use a brighter purple for the dark theme (contrast 6.87).