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

test/Spec.hs

@@ -4,6 +4,6 @@ import Test.Hspec
 
 main :: IO ()
 main = hspec $ do
-  describe "Converge" $ do
-    it "compiles" $ do
-      True `shouldBe` True
+    describe "Converge" $ do
+        it "compiles" $ do
+            True `shouldBe` True