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To allow svg caching add the version to the svg file and sed the used
version file in the css file.

Remove the unrequired -2 option when attaching a tmux session. Get rid
of the warning when selecting the window by providing the missing + and
remove the unrequired split-window.

The icons are part of the free Octicons set

Append the git tag version to the JS/CSS files so we can set cache
headers in nginx.

Closes: #2

Reduce the size of the svg on build with ~ 50% by using svgcleaner.

Show the increase of website size in merge requests.

As a bonus terser supports ES6.

Instead of relying on made up pixel values, use bulm'a definitions
except for > 2048px as that's where bulma is at the moment lacking in
mixin presets.

Although the Makefile has the required dependencies, once everything is
launched in parallel making the live reloader unavailable as caddy
already launches.