turris-webapps: update to version 3.4

Including previous updates:

Bump v3.4
  * Add light/dark favicon switch
  * Reduce app card's width size
  * Fix default's app focus outline unevenness
  * Fix "default" wording

Bump v3.3
  * Fix odd icons padding
  * Fix cards transitions

Bump v3.2
  * Fix shadows in Dark Mode
  * Reduce intro paddings
  * Style noscript warning
  * Fix dark-mode toggle on page load
  * Add dark-mode source js & update minified file