Add blue color scheme from wp-admin

[mreishus]

One part of #47036

Changes proposed in this Pull Request

• Add blue color scheme

Testing instructions

• Visit /me/account
• Choose blue and save

To see the wp-admin color scheme, create an atomic site, then visit /wp-admin/profile.php, choose color scheme and save.

Calypso:

Wp-Admin:

[matticbot]

Test live: https://calypso.live/?branch=add/color-scheme-blue

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~39 bytes added 📈 [gzipped])

name     parsed_size           gzip_size
account       +154 B  (+0.0%)      +39 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Async-loaded Components (~74 bytes added 📈 [gzipped])

name                      parsed_size           gzip_size
async-load-design-blocks       +154 B  (+0.0%)      +38 B  (+0.0%)
async-load-design              +154 B  (+0.0%)      +36 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[cpapazoglou]

Thanks @mreishus!

LGTM!