docs: release notes format and patch notes for v2.0.0-beta to v2.4.0-beta

docs/releases/v2.1.0-beta.md

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+This release adds image upload to the article editor and fixes several rough edges from v2.0.0-beta.
+
+## New
+
+**Image upload in the article editor**
+- The editor's Image toolbar button, or dropping a file onto the editor, opens an upload dialog.
+- Choose or drop a PNG, JPEG, WEBP or SVG file up to 10 MB. Progress is shown live, and the image is inserted at the cursor as soon as it is uploaded.
+- Invalid files (wrong type or too large) are rejected in the browser before anything is sent. The same wording is reused if the server rejects a file the browser let through.
+- A failed upload leaves the article untouched and offers a retry.
+
+## Improvements and fixes
+- Uploaded images now render in the editor and the article body. The dev server proxy was missing a route for the endpoint that serves them.
+- Clicking a row in the article list now opens the editor. The row-click handler was reading the wrong argument.
+- The article details panel's copy URL control now copies the link and confirms with a toast.
+- The user menu's dropdown trigger no longer misrenders when the sidebar is collapsed.
+- The sidebar's collapsed or expanded state is remembered across reloads.
+- Smaller styling and layout fixes in the article details panel, editor toolbar and new-article dialog.
+
+## Upgrading
+- Replace the binary and restart.