Removed v5.1 in public with mike 2.0.0

public/latest

public/latestR5

public/v5.1/1/index.html

public/v5.1/2.1/index.html

public/v5.1/2.2/index.html

public/v5.1/2/index.html

public/v5.1/3.1/index.html

public/v5.1/3.2/index.html

public/v5.1/3/index.html

public/v5.1/4/index.html

public/v5.1/404.html

public/v5.1/5.1/index.html

public/v5.1/5.2/index.html

public/v5.1/5.3/index.html

public/v5.1/5.4/index.html

public/v5.1/5.5/index.html

public/v5.1/5.6/index.html

public/v5.1/5/index.html

public/v5.1/6/index.html

public/v5.1/7.0/index.html