Trying to Debug Theme, added code in template, site lost

I skimmed a forum to debug the themes to my website, following many warning notices. I skimmed the forum and made the mistake of adding (debug true) to the theme templates. Now the website has disappeared. Is there a way to turn back the clock to early this morning? I think someone did that for me that last time I made a fatal mistake.

kathleenmaher.net
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