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Markdown pages can have content before the first heading, e.g. HTML tags containing a floated image, a style tag, a script, etc. This causes the page to show up as "Untitled" in search, see e.g. sourcegraph/about#1892. I've also seen this with some other pages. Comments were explicitly handled but all other tags were not. This changes it to simply use the first level-1 heading it can find, no matter if there are any other tags before it.