Revert "Add comment widget"

This reverts commit 06de1c6125aeaebbd3395177cd72292f18f63845.

Revert "Add comment module using Disqus to index"

This reverts commit 601ef3eabc3c141d7afece081782d9fe5806898f.

Revert "Add comment module using Disqus"

This reverts commit 55096886c0e1e4bfcfc8cb25c0979eede00fb2e0.