chore: Update gitignore

 * Ignore profiling artifacts
 * Add emacs and nix artifacts

Author: sgillespie

.gitignore

@@ -1,16 +1,34 @@
-dist-newstyle/
+# Haskell
+.ghc.environment.*
 .stack-work/
+cabal.project.local
+dist-newstyle/
 dist
-*.swp
+
+*.prof
+*.aux
+*.hp
+*.eventlog
+
 log-dir
-result*
 launch_*
-cabal.project.local
 gen/
-/.vscode
-.DS_Store
-
 cardano-chain-gen/test/testfiles/temp/
 /secp256k1/
 
-.ghc.environment.*
+# Vim
+*.swp
+
+# Emacs
+.dir-locals.el
+
+# Nix
+.direnv
+.envrc
+result*
+
+# VS Code
+/.vscode
+
+# MacOS
+.DS_Store