Missing `#comments` anchor on article pages
Clicking an "_X_ comments" link from the index takes you to a URL with a `#comments` anchor at the end, for example:
https://blog.torproject.org/blog/we-are-upgrading-our-blog#comments
It's supposed to scroll you down to the comments, but the article page is missing the appropriate anchor.
This bit of HTML:
```
<section>
<h2>Comments</h2>
```
needs to change to something like this:
```
<section id="comments">
<h2>Comments</h2>
```
issue