Suggestion: Automatic gzip for known "mime types"

[beikeland]

Would love to see options for automatically adding gzipped versions of webserver related files.

I.e. add smoothie.js to data folder, and automagically get both smoothie.js and smoothie.js.gz in the SPIFFS binary. Similar for .html etc.

Or updating existing .gz files if their uncompressed counterpart is modified, or a warning. (Yes, I spent some time wondering why my modified .js file wasn't uploaded:))