svg to avif test

[plowsof]

closes #2274

• ive hard coded the roadmap (emojis/*) to 64x64.. looks too big. will try 32x32. these svgs have no implicit dimensions hardcoded and use css to fill elements.
• wallet-generator.html links to the safari tab. not editing. we've deleted the svg and it will change the hash of the file / require it to be singed again by bF
• i have left the font svg files untouched, as i'd have to research whats going on there. it seems that our css has the svg as a fallback if the browser can not use the other font file formats (? i have no idea why or if this is a early 2000's thing)
• on our press kit, the svg of the mrl-logo is served, so that remains in our file tree but site displays the png version

todo: delete the png files if avifs are OK