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

[Marwin Hochfelsner]

@hlfan commented on this pull request.



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

Pretty much exactly. You get the in-between response object to not need to download the response fully or change the handling based on the response type (like `text`, `json`, `arrayBuffer` functions).

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