fixed link

docs/README.md

@@ -6,4 +6,4 @@ To preview the documentation, run:
 docker run --rm --volume=$PWD:/srv/jekyll -p 127.0.0.1:4000:4000 -it jekyll/jekyll:pages jekyll serve
 ```
 
-From the `docs` directory.
+From the `docs` directory. Then visit: [http://127.0.0.1:4000/talk/](http://127.0.0.1:4000/talk/).

docs/_config.yml

@@ -135,7 +135,7 @@ exclude:
   - node_modules
   - package.json
   - Rakefile
-  - README
+  - README.md
   - tmp
 keep_files:
   - .git