Fix tests

Author: jorgensd

_test/test_links.py

@@ -42,6 +42,7 @@ def load_page_list(dir):
     "google-summer-of-code-2017",
     "google-summer-of-code-2018",
     "people-of-fenics",
+    "gsoc"
 ])
 def test_permalinks(page):
     """Test that permalink exists."""

gsoc/gsoc.md

@@ -1,4 +1,7 @@
-# Google Summer of Code
+---
+title: Google Summer of Code
+permalink: /gsoc/
+---
 
 The FEniCS Project has participated in the [Google Summer of Code](https://summerofcode.withgoogle.com) (GSoC) through our fiscal sponsorship agreement with [NumFOCUS](https://numfocus.org/).