build: add simple http server command

Signed-off-by: Micky Ching <mickyching@gmail.com>
gh-pages: not exclude html files

Signed-off-by: Micky Ching <mickyching@gmail.com>
gh-pages: publish emacs configuration

Signed-off-by: Micky Ching <mickyching@gmail.com>
Merge branch 'master' into gh-pages
gh-pages: publish git and C++

Signed-off-by: Micky Ching <mickyching@gmail.com>