Fix #1

fix #1

Fix windows problems

1. fix hexo server start/stop problems on windows;
2. move config file(.hexo-local-admin-config.json) to os.homedir (or "os.homedir\Documents" on windows).

Support cli

Now you can install this package from npm!!!
try npm install -g hexo-local-admin
then try
hexo-admin -h to view usage information

FYI, this package is not supposed to be required by any other packages.

Add hexo actions

Now you can launch/stop hexo server and deploy your site!