Request no cache

Sends requests with static file responses to not cache. This means the webapp won't be cached and changes to the UI will be immediately apparent.

Merge checklist:

• All new/changed functions have up to date typehints and docstrings
• Any UI updates have a before and after screenshot in the MR description
• Unit testing of new functionality has similar or better coverage that similar existing code
• This code has been tested on a microscope
  • With webapp has been recompiled (if changed)
  • With updated settings JSON (if changed)
  • SmartScan and live stitching work

Related issues:

Hugely helps #313 (closed)