* doc: Update English README, add Chinese readme back
* doc: fix file name and polish documentation
* <feat> Initialize AntStep and AntSteps
* feat (steps): Add additional demos for steps. Pending on Click features development.
* fix: move step navigation special style to style.less
* feat：
1.add the "longBodyMode" parameter to AntLayoutSider.
2.add the "longContentMode" parameter to antlaycontent
3.add the self-adaption mode to side bar.
fix：
1.fix doc project page layout.
2.set the default width value, cause if use forgot set this value, there throw the nullreference exception.
3.fix the user set 100% or xxxVH etc. the old style will add the px end of string.
style：
1.fix the menu margin, you will found that you lost one menu item which lastest in list.
2.add the footer to main layout
refactor：
1.Hide the adWidth
Co-authored-by: ElderJames <shunjiey@hotmail.com>
