Hey @matuzo

Fixes #74

In this PR

The bulk of this PR is to do with logo usage

• Logo enhancments as per Logo SVG improvements #74 (Refactored, minified)
• Replace the logo.txt XHR script with an inlined SVG in the HTML
• Remove obsolete logo animation styles (?)
• Replace the pentagramm.svg and pentagramm-light.svg versions with the new structure.

Notes

• Unfortunately, the mask has to be repeated inside each child SVG (where we <use> the pentacle <circle>), since Chromium/Webkit browsers don't allow for external URI <mask>s.
• At some point, we could replace pentagramm(-light).svg with inline versions, and therefore re-using the SVG sprite.
• We could use logo.svg in the Web Manifest, and Safari pinned tab mask. I'll leave that for PWA icon fixes.

Results

The logo improvments can be seen in the comments on #74

As for site performance, rudimentary testing on my local environment yielded:

• Total bytes (un-gzipped)
  • 125kB (before)
  • 102kB (after)
• HTML bytes (un-gzipped)
  • 21kB (before)
  • 56kB (after)

The HTML payload is now 11kB g-zipped, which keeps us below the 14kB threshhold.

Waddayathink?
-S