Prepared CHANGELOG for next release

Also enhanced the RELEASE_CHECKLIST steps and structute

Enhanced formatting for previous release in CHANGELOG

.data/RELEASE_CHECKLIST.md

@@ -1,13 +1,17 @@
-# Theme Update Procedure
+# About
+This document contains information on how to create and maintain releases for this project
 
+# Guides
+
+## Stable Release
 1. Make changes to any theme(-s)
 2. Update [VERSIONS_ARCHIVE.md](../VERSIONS_ARCHIVE.md) :
    - Change old versions link from `*/releases/latest/download/*` to `*/releases/{tagname}/download/*`
    - Add new version with link to `*/releases/latest/download/*`
 3. Add new version to table in [README.md #development-status](../README.md#development-status)
-4. Commit and Create new tag. Name sample: 
-   - `release-yyyymmdd`
-5. Push tag to remote and create **release**
-6. ~~Attach <ins>ALL</ins> theme files *(Even if they don't have any changes)* to release to make `*/releases/latest/download/*` work properly~~
-    > Files are now automatically attached to release with Github Actions
-7. That's all, watch and **pray** 👏
+4. Commit changes and create a new tag. Naming convention: 
+   - `release-yyyymmdd` *(optional +`-<codename>`)*
+5. Merge all the changes to `master` branch
+6. Push all changes and the tag to remote
+7. Create the Github release
+8. That's it - Github Actions CI will now take care of all that's left, watch and **pray** 👏

CHANGELOG.md

@@ -1,20 +1,24 @@
 # Dark Shell - Changelog
 
 
-## Development
-### Android
+## Update 2023.02.21 "Neue Welle"
+
+> **Summary**
+> This release contains various patches for the previous update
+
+### Android 4.2
 #### Fixed
 - Chat list: Online status icon fixed again
 
-### TDesktop
+### TDesktop 2.4
 #### Fixed
 - Chat background image color tweaked to match the overall scheme
 
 
 ## Update 2023.02.19 "Welle"
 
-**Summary**
-This small update is aimed at fixing existing issues and making minor improvements towards readability
+> **Summary**
+> This small update is aimed at fixing existing issues and making minor improvements towards readability
 
 ### Android v4.1
 #### Fixed