* fix(scroll): outer scroll disabled when inner scroll invoke scrollTo

* chore(scroll): fix test bug in nest scroll

* fix(scroll): add 'none' nestMode

* fix(scroll-nav): can not scroll when nav-bar reach boundary

* chore(scroll): update scroll docs

* feat(mixins): add new parent minxin creator

* feat(sticky): init sticky component

* feat(scroll-nav-bar): init logic

* feat(scroll-nav): init logic

* feat(modules): add sticky, scroll-nav, scroll-nav-bar

* test(sticky): init tests

* test(scroll-bar-bar): init tests

* test(scroll-nav): init tests

* docs(scroll-nav-bar): init doc

* docs(sticky): init doc

* docs(scroll-nav): init docs

* docs(entry): add sticky, scroll-nav-bar, scroll-nav entries

* chore(package.json): better-scroll to 1.12.4

* chore(yarn): yarn update