Modify: add twitter icon
Merge branch 'feature/revise/introduce' into develop
Modify: revise 2-3-1
Modify: add table of contents
Modify: typo
New: add Kanchoku introduce
Merge branch 'feature/revise/kanchoku' into develop
New: add twitter name in title
Modify: revise 2-3-1
Merge branch 'feature/revise/2-3-1' into develop
Modify: favorite order
Modify: removed a char
Modify: add slide feature
Merge branch 'feature/revise/introduction' into develop
Modify: add slides 2-3-3
Merge branch 'feature/revise/2-3-3' into develop
Modify: add (2.3.3)
Modify: revised 2-3-4
Merge branch 'feature/revise/2-3-4' into develop
Modify: revised 2-3-2