Fix compilation errors

- Remove nonexistent confDebounce field from WatchConfig (fsnotify 0.4.4.0)
- Remove unused Generic deriving and GHC.Generics import
- Replace .!= with fromMaybe (not re-exported by Data.Yaml)
- Add missing Data.Text import in Main.hs
- Use git -C flag in runGitIn to run in the correct repo directory
- Clean up unused imports

stack.yaml.lock

@@ -0,0 +1,12 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/topics/lock_files
+
+packages: []
+snapshots:
+- completed:
+    sha256: abc790b571e0c70e929db74b329e3c18d7e76a6e173e8bdf94f1ba20770d4c24
+    size: 728990
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/24/38.yaml
+  original: lts-24.38