Move tiles and other image resources outside of the build process, share them from the host instead

[3vcloud]

[11:57]Jon [SNOW]: @Furtun an unexpected side effect of building the party search server as part of the docker build process instead of just sharing the folders across - file modified times for all of the tiles are wiped, meaning "Last-Modified" headers for map tiles invalidate browser cache

[11:58]Jon [SNOW]: I commented out a line of code on server.mjs, had to rebuild the container image from scratch, and subsequently ddosed the server when i restarted it with all the visitors

[11:59]Jon [SNOW]: cloudflare sees that the tile image(s) are "new" and thinks "right, time to clear my own cache too now" so the CF layer doesn't help then eitehr