Fix blog comment indentation
The comment threads on the blog became improperly indented in early 2021. In the more egregious cases, the box in which to write a comment is indented as well. Examples:
- https://blog.torproject.org/tor-bug-smash-fund-yr2-progress#comments
- https://blog.torproject.org/new-release-tor-browser-10012#comments
- https://blog.torproject.org/new-release-tor-browser-105a11#comments
- https://blog.torproject.org/new-release-tor-browser-10013#comments
- https://blog.torproject.org/new-release-tor-browser-105a12#comments
- https://blog.torproject.org/new-release-tor-browser-10014#comments
- https://blog.torproject.org/new-release-tor-browser-10015#comments
- https://blog.torproject.org/new-release-tor-browser-105a14#comments