docs: Reminding myself how to make a release.

metadata/en-US/changelogs/28.txt

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+* Command-line publishing of SSB messages.
+* Minor SSB replication improvements.
+* Disallow rich text paste on more browsers.
+* The identity app lets you change the server account.
+* Fix SSB profile icons stretching.
+* Fixed the iPhone app missing data.
+* Added a button to initiate sync.
+* Fixed the AppImage.
+* Android version compatibility fixes.
+* Updates:
+  * CodeMirror
+  * CommonMark 0.31.2
+  * Lit 3.2.1
+  * OpenSSL 3.4.0
+  * c-ares 1.34.2
+  * libbacktrace
+  * libuv 1.49.2
+  * sqlite 3.47.0