Add table of contents to GSoC page.

Author: kgodey

content/gsoc-2019/contents.lr

@@ -1,5 +1,7 @@
 _model: page
 ---
+_template: page-with-toc.html
+---
 title: Google Summer of Code 2019
 ---
 body:
@@ -27,7 +29,7 @@ Here are short bios of each of our 2019 mentors. Please use first names or Slack
 * [Sophine Clachar](https://creativecommons.org/author/sclachar/) (`Sophine` on Slack)
 * [Timid Robot Zehta](https://creativecommons.org/author/timidcreativecommons-org/) (`Timid Robot` on Slack)
 
-## Proposal review criteria
+## Proposal Review Criteria
 
 We do not have formal guidelines for reviewing proposals, but here are a few things we consider:
 * **Quality of the proposal**: This is the most important thing. A good proposal includes attention to detail, externally measurable milestones, consideration for future maintainability and community involvement, and a demonstration of your skills.
@@ -37,7 +39,7 @@ We do not have formal guidelines for reviewing proposals, but here are a few thi
 
 However, this is all relative. For example. if you have a great proposal, but haven't contributed code to CC yet, you still have a good shot.
 
-## Number of accepted students
+## Number of Accepted Students
 
 We can only accept a fixed number of students, which is determined by the number of slots allocated to
  us by the Google Summer of Code administrators. Even though there are `n` proposals