update changelog and add link in docs

docs/content/_index.md

@@ -7,6 +7,8 @@ Backy is a tool for automating data backup and remote command execution. It can
 
 Why the name Backy? Because I wanted an app for backups.
 
+View the [changelog here](https://git.andrewnw.xyz/CyberShell/backy/src/branch/master/CHANGELOG.md).
+
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