chore: Update .gitignore and remove tracked ignored files

.gitignore

@@ -1 +1,25 @@
-/target
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+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
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# Env variables
+.env
+.env.*
+
+# SQLite databases
+*.db
+*.db-*
+*.sqlite
+*.sqlite3
+
+# Secrets
+secrets.json
+secrets.json.bak