update project structure

- move agent to /agent
- change /beszel to /src
- update workflows and docker builds

main.go

@@ -0,0 +1,10 @@
+package beszel
+
+import "github.com/blang/semver"
+
+const (
+	Version = "0.12.7"
+	AppName = "beszel"
+)
+
+var MinVersionCbor = semver.MustParse("0.12.0")