Rename the support/jshint directory.

Summary: It is somewhat overkill to use an entire directory for a single file (the configuration file for JSHint). Instead, rename the directory so that it could (theoretically) be used for other linter configuration files.

Test Plan: Ran `arc lint -- webroot/rsrc/js/core/phtize.js` just to make sure everything still works.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9944

.arclint

@@ -24,13 +24,13 @@
     "jshint": {
       "type": "jshint",
       "include": "(\\.js$)",
-      "jshint.jshintrc": "support/jshint/jshintconfig"
+      "jshint.jshintrc": "support/lint/jshintrc"
     },
     "json": {
       "type": "json",
       "include": [
         "(^src/docs/book/.*\\.book$)",
-        "(^support/jshint/jshintconfig$)",
+        "(^support/lint/jshintrc$)",
         "(^\\.arcconfig$)",
         "(^\\.arclint$)",
         "(\\.json$)"