only works where svh is supported: https://caniuse.com/viewport-unit-variants

update hotlist only after user buys item

See merge request mukas/mukas!9

moved buy to own function

fixed wrong html comment syntax (messed up sublime highlighting)

update logo

See merge request mukas/mukas!8

- parameter column has multiple meanings
- also prepare a column for user
- /log endpoint also returns the item name, if applicable (otherwise
  null)
- item name can be picked up by CLI client
- /log?type=html endpoint still expensive, performs a query per row

Should not make a difference to the user, though.

- also display clustom prompts in fzf