Fix Express.js regex for docs & blog (#739)

lib/server/server.js

@@ -130,7 +130,7 @@ function execute(port) {
   // handle all requests for document pages
   const app = express();
 
-  app.get(/^\/docs\/.*html$/, (req, res, next) => {
+  app.get(/\/docs\/.*html$/, (req, res, next) => {
     let url = req.path.toString().replace(siteConfig.baseUrl, '');
 
     // links is a map from a permalink to an id for each document
@@ -272,7 +272,7 @@ function execute(port) {
   });
 
   // Handle all requests for blog pages and posts.
-  app.get(/^\/blog\/.*html$/, (req, res) => {
+  app.get(/\/blog\/.*html$/, (req, res) => {
     // Regenerate the blog metadata in case it has changed. Consider improving
     // this to regenerate on file save rather than on page request.
     reloadMetadataBlog();