Clean up tips

Tips tagged as "Deprecated", "OriginalDuplicate", "OriginalMissing" and "Removed" has been removed.

First complete release

Added

• Help for plugin :help vim-tips-wiki

• Categories at the end of a tip, that you can use to browse tags in same category

• Lists of all tips ordered by number, alphabetically or by category :help vim-tips-wiki-lists

• Command to view random tip :RandomVimTip