Added 'The gist of it' sections.

examples/hakyll/tutorials/part01.markdown

@@ -226,3 +226,9 @@ main = hakyll "http://example.com" $ do
 
 To setup your site, simply copy the contents of `_site` to your hosting provider
 using your favorite piece of software.
+
+## The gist of it
+
+- You render "pages" with "templates".
+- The most common render function is `renderChain`.
+- Hakyll also deals with static files and css.

examples/hakyll/tutorials/part03.markdown

@@ -166,3 +166,9 @@ where render = renderChain ["templates/default.html"]
 ~~~~~
 
 And now every page will include the footer.
+
+## The gist of it
+
+- Pages are just key-value mappings.
+- You can have multiple sections in every page.
+- Combine pages using the `combine` function.