Add Cache-Control header to JS and CSS requests to avoid aggresive caching

[alexreinert]

Only first step, real solution would be to include unique url parameter on each request (e.g. firmware version)

[jens-maus]

Thanks for this PR. I will try to integrate this in RaspberryMatic which in the end will then (if it proofs useful) will end up in occu again ;)

See here for more discussion on that matter:
jens-maus/RaspberryMatic#245

[jens-maus]

Would be good to actually identify all uses in webui files where a unique url parameter would be required or helpful.

[alexreinert]

@eq-3 Any chances to get this PR merged?

[jens-maus]

It is already merged into the latest 2.33.x development snapshot. See:
https://github.com/eq-3/occu/blob/master/arm-gnueabihf/packages/lighttpd/etc/lighttpd/conf.d/headers.conf