Split page generation into data acquisition -> processing -> dictionary -> rendering

[liambaloh]

Split processing into four stages: Data acquisition -> Data processing -> Dictionary -> Rendering

Data acquisition: Fetch all the data we'll need (either entire database or use feature flags to determine what we need)
Data processing: Process the data to get all the values we'll need to show to the user or make the site work properly
Dictionary: Fill the dictionary for rendering with all the content, formatted for output
Rendering: Render with mustache using templates and the dictionary

[liambaloh]

Mostly fulfilled by 3dc311b and 76281ad. After these two updates, the site's context has changed enough to make the plan in this issue obsolete.