Update .gitignore with shuttle.rs

Author: jdh8

.gitignore

@@ -1,7 +1,3 @@
-# Generated by Cargo
-# will have compiled files and executables
-/target/
-
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
 Cargo.lock
@@ -12,6 +8,7 @@ Cargo.lock
 # VS Code config
 /.vscode/
 
-# Shuttle.rs secrets
-Secrets.toml
-Secrets.dev.toml
+# Shuttle.rs generated files
+/target
+.shuttle*
+Secrets*.toml