Move config out of statics path

Since static path is providing with a high expiration data, we provide
configs via API. This shouldn't add any noticeable load while making it
uncached and this way working again.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/web/statusRouter.js

@@ -90,3 +90,20 @@ statusRouter.post('/temp', urlencodedParser, function (req, res) {
     }
   }
 })
+
+statusRouter.get('/config', function (req, res) {
+  var data = {
+    domain: config.domain,
+    urlpath: config.urlPath,
+    debug: config.debug,
+    version: config.version,
+    DROPBOX_APP_KEY: config.dropbox.appKey,
+    allowedUploadMimeTypes: config.allowedUploadMimeTypes
+  }
+  res.set({
+    'Cache-Control': 'private', // only cache by client
+    'X-Robots-Tag': 'noindex, nofollow', // prevent crawling
+    'HackMD-Version': config.version
+  })
+  res.render(config.constantsPath, data)
+})