docs: updating reference landing page ROCKS-2602

docs/reference/index.md

@@ -1,10 +1,38 @@
 # Reference
 
+This section provides concise references on available commands, package slices, and security.
+
+## Commands
+
+The `chisel` command has several subcommands.
+
 ```{toctree}
 :maxdepth: 1
 
 cmd/index
+```
+
+## Package slices
+Chisel relies on package slices.
+
+```{toctree}
+:maxdepth: 1
+
 chisel-releases/index
+```
+## Security
+Chisel records package, slice, and file metadata to ensure file-level integrity and traceability of the slices.
+
+```{toctree}
+:maxdepth: 1
+
 Manifest <manifest>
+```
+
+Cryptographic verification ensures the integrity and authenticity of the files.
+
+```{toctree}
+:maxdepth: 1
+
 Security Documentation <security>
 ```