Fix links.

website/docs/assignments/presentations.md

@@ -3,7 +3,7 @@
 In groups of two you will lead one lecture, presenting a few related papers and
 guiding the discussion. We will have presentations most Wednesdays and Fridays.
 Please sign up for a presentation slot by **Monday, September 9**; see the
-[calendar](schedule/lectures.md) for the topic and papers for each slot.
+[calendar](../schedule/lectures.md) for the topic and papers for each slot.
 
 ## Presentation tips
 
@@ -78,4 +78,4 @@ different topic---maybe you'll learn something new!
 If you want to present different papers on the same topic, or change the topic
 entirely, please talk to me first. Note that the papers have been selected to be
 related and focused on a specific topic. There is an additional list of
-suggested papers [here](resources/readings.md).
+suggested papers [here](../resources/readings.md).

website/docs/assignments/summaries.md

@@ -2,7 +2,7 @@
 
 In groups of two you will write up a detailed summary of another group's
 presentation. Please sign up for a report slot by **Monday, September 9**; see
-the [calendar](schedule/lectures.md) for the topic and suggested papers for each
+the [calendar](../schedule/lectures.md) for the topic and suggested papers for each
 slot.
 
 ## Summary tips
@@ -32,14 +32,14 @@ your mind.
 - **How should we type up summaries?**
 
 Notes should be typed up neatly in LaTeX using this
-[template](resources/summary-template.tex). You may make additional macros if
+[template](../resources/summary-template.tex). You may make additional macros if
 needed, but try to stick to what is there.
 
 - **How should we turn in summaries?**
 
-Share your summary with me by sending a link to [ShareLaTeX](sharelatex.com).
-Note that you can work on the summary in some other environment, then copy to
-ShareLaTeX if you prefer.
+Share your summary with me by sending a link to
+[ShareLaTeX](https://sharelatex.com).  Note that you can work on the summary in
+some other environment, then copy to ShareLaTeX if you prefer.
 
 - **How long should summaries be?**