Adding guild channels to the simple-demo.

[Lil-Pandaa]

I've fixed the majority of issues that were located in my last PR ( #22 ).

Can be merged if you:

• Fix broken path for includes directory in index.php. ☑️

• Add the new function to the root discord.php, as per contributing guidelines.☑️

• Use the variable defined in the config.php for bot token, like in the other example functions.☑️

• Comment out the feature in login.php, and skip the manual check in the file completely. You can do a check to see if the session variable is populated on the index page, and only display the table if it is set instead. ⬛
  I think I have done what you're asking however I'm not entirely sure.

• Remove duplicate channels in the table. The example of checking the type should suffice. ☑️

In the future, please be wary of committing sensitive data to your repo, and especially trying to push these upstream.
While I'm able to squash the commits, to leave out the information, it will still show up in your own repo.

Thank you for pointing this out to me. I have deleted the old repo and re-forked it so that the old leaked token, although it has been regenerated, is now not viewable by the public eye.

Any questions please @ me or ping me inside discord