Normalize the final new line

Fixes #310
Some files had no newlines, some had 1 newline and some more than 1 newline.
Normalize them all to have only 1 newline at the end of all files.

pages/common/awk.md

@@ -17,5 +17,3 @@
 - Sum the values in the first column and pretty-print the values and then the total
 
 `awk '{s+=$1; print $1} END {print "--------"; print s}' {{filename}}`
-
-