feat: improve loading screen to be more like DOS

[mesqueeb]

underneath the loading animation in the same vue component:

• add this text for desktop: press any key to continue
• add this text for mobile: click anywhere to continue
• add event handler for any global keypress that will close the loading dialog if it's open (use vue-global-events)
• have the text be animated so it's "typed" with a really old font to give the DOS kinda vibe

for inspiration see the http://poolside.fm loading screen

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PS: Since we're already live, any new ticket is to be branched from production with branch name pr-<issue nr.> and make a PR towards production again.
Also, remember we're using npm again now (as opposed to yarn).