Improve implementation of server

[davenquinn]

Starting point for a more straightforward implementation of the app's Express server backend

• Start integrating vike-reactfor standard handling of page variables. Right now, this just helps us set the page title, but we'll eventually use it to standardize pages and layout.
• Move the server to typescript using tsx just-in-time compilation
• Add individual page titles to several pages (columns, main map interface)

Several things remain unfinished:

• Fully integrate vike-react and remove our own custom rendering to the extent possible
• Add titles and accurate descriptions to more pages
• Integrate title/description handling with sitemap for unified configuration