[openstreetmap/openstreetmap-website] Make loadSidebarContent use promises (PR #7226)

[Tom Hughes]

@tomhughes commented on this pull request.



>          const title = response.headers.get("X-Page-Title");
         if (title) document.title = decodeURIComponent(title);

I mean I don't entirely even know what constitutes the content being downloaded but I assume you're saying the initial promise is resolved by fetch as soon as it has the headers and only once the promise returned by the `text` function on the response is resolved is the content guaranteed to be complete?

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