fixed typo + broken link

secrets/index.md

@@ -1,6 +1,6 @@
 # Agenix Secrets
 
-[return to index](../index.md)
+[return to index](../README.md)
 
 this folder primarily deals with secrets within our nixos system. to do so we make use of the [agenix module](https://github.com/ryantm/agenix), which will be described below.
 
@@ -38,4 +38,4 @@ please note, also, that if using a password protected private key, you will need
 
 ## further TODO
 
-* add example of using the deccrypted secret in a safe way.
+* add example of using the decrypted secret in a safe way.