Remove GitHub since it has native support

[FranklinYu]

GitHub now has a button natively, so it’s no longer useful to have this button on Markdown pages (and it didn’t show up anyway). Note that #1 is still interesting though, so we may want to keep the domain permission.

[Mte90]

Now the button is duplicated, the one of this extension is put hover the GitHub native button.

[Mte90]

so I was looking for a ticket but I didn't expected that I already looked the same thing.

[john-peterson]

Do you have this in a fork?

I'm on the phone now so it's hard for me to do any coding now I am noticing everything I need but. I don't have my computer all month

Some add-ons have a config page

moz-extension://blah blah /config.html

But I don't know how to find the GUID on the phone. Firefox mobile nightly

What I really want is a BLACKLIST not a white list.

So all broken sites are enabled by default http://*

And functional sites are black listed http://github

I have to remember to fork this when I am in front of a computer again