Fix file_types config (#26)

Fixes #25

- Prepend each path with `**/` (this seems like an oversight?)
- Add `*.gitconfig` (Zed already matches `.gitconfig`, but not
`foo.gitconfig`)

Author: injust

.zed/settings.json

@@ -9,8 +9,8 @@
     }
   },
   "file_types": {
-    "Git Attributes": ["{git,.git,.git/info}/attributes"],
-    "Git Config": ["{git,.git/modules,.git/modules/*}/config"],
-    "Git Ignore": ["{git,.git}/ignore", ".git/info/exclude"]
+    "Git Attributes": ["**/{git,.git,.git/info}/attributes"],
+    "Git Config": ["*.gitconfig", "**/{git,.git/modules,.git/modules/*}/config"],
+    "Git Ignore": ["**/{git,.git}/ignore", "**/.git/info/exclude"]
   }
 }

README.md

@@ -17,10 +17,10 @@ This extension will automatically recognize the majority of filenames/extensions
 ```json
 {
   "file_types": {
-    "Git Attributes": ["{git,.git,.git/info}/attributes"],
-    "Git Config": ["{git,.git/modules,.git/modules/*}/config"],
-    "Git Ignore": ["{git,.git}/ignore", ".git/info/exclude"]
-  }
+    "Git Attributes": ["**/{git,.git,.git/info}/attributes"],
+    "Git Config": ["*.gitconfig", "**/{git,.git/modules,.git/modules/*}/config"],
+    "Git Ignore": ["**/{git,.git}/ignore", "**/.git/info/exclude"]
+  },
 }
 ```