[Feature] Add pjax support (#135)

* feat(pjax): add a not working pjax

* feat(pjax): another not working pjax

* feat(pjax): fix toclist error

* chore: turn off pwa to see whether it makes things better

* feat(pjax): fix CSS style

- Change pjax lib
- Fix CSS style

* fix: bind themeInit to pjax:success

* chore: reload comment

* fix: reload comments

* fix: destroy lightgallery at pjax:send

* fix: import comment as pjax-assets

- Update pjax.min.js

* fix: tocScroll is fixed

* chore: re-enable PWA

* fix: fix mobile header

* docs: update documentation