github vs netlify
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github: spaces to save data ie hard disk
netlify: control platform

login
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netlify use github account to login: no need to apply another netlify account
netlify logout does NOT mean logout, github has to logout first!

implement:
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1. cust domain
2. https

link my domain with ntlify: 
 1. edit CNAME (@ my ns server): change at dns
 2. netlify domain management / Add then change at netlify 

 # note: no need for name.com since pdn.ifong.org ns is sun.ifong.org
 # however netlify name db look like also keep tracking this domain (nf.pdn.ifong.org)