* fix dead link

* test=develop

* this is a test pull-request, test=release/1.8

* fix doc, test=release/1.8

* fix doc, test=release/1.8

* fix doc, test=release/1.8

* update english installation documents, test=develop

* fix index_en.rst, test=develop

* add en index for install doc,fix some expressions

* Appendix title

* add learning_materials_en and update install doc to the latest

* Update learning_materials_en.md

* add installTranslationEnModify for xx

* Update CentOSen.md

* Update CentOSen.md

* Update CentOSen.md

* Update FAQen.md

* Update CentOSen.md

* Update MacOSen.md

* Update CentOSen.md

* Update MacOSen.md

* Update Ubuntuen.md

* Update CentOSen.md

* Update Ubuntuen.md

* Update Windowsen.md

* Update Ubuntuen.md

* Update Ubuntuen.md

* Update Windowsen.md

* Update CentOSen.md

* review CentosCompileEn

modify existing problems

* Update compileMacOSen.md

* Update compileCentOSen.md

fix title

* Update compileMacOSen.md

fix titles

* review and update Ubuntu compile

* review Windows Compile

* review Appendix

* filename correction and some fix

* Update fromsource_en.rst