Accelerating the website to the green zone on Pagespeed

Initial speed metrics:
20 mobile/52 desktop

Final speed metrics:
96 mobile/99 desktop

Completed work
- inline CSS
- JS bundling for each page
- removal of unused CSS
- minification/compression
- removal of unnecessary fonts
- image optimization, providing images of different sizes depending
on device size/density
- enabling page caching
- creating image sprites
...