content/go-fonts: pngcrush images

Further compression is probably obtainable (by reducing the color depth
on the monochrome images) but this expedient change reduces the total
image size by more than 1MB (about half).

Change-Id: I1c24a31b82daf2a058acce3a58b6c33dc630b663
Reviewed-on: https://go-review.googlesource.com/33261
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/content/go-fonts/abdgpq-mono.png b/content/go-fonts/abdgpq-mono.png
index cd23025..9f1455e 100644
--- a/content/go-fonts/abdgpq-mono.png
+++ b/content/go-fonts/abdgpq-mono.png
Binary files differ
diff --git a/content/go-fonts/abdgpq-proportional.png b/content/go-fonts/abdgpq-proportional.png
index 5d777f1..1a000cd 100644
--- a/content/go-fonts/abdgpq-proportional.png
+++ b/content/go-fonts/abdgpq-proportional.png
Binary files differ
diff --git a/content/go-fonts/go-font-code.png b/content/go-fonts/go-font-code.png
index 363f1bf..630cccf 100644
--- a/content/go-fonts/go-font-code.png
+++ b/content/go-fonts/go-font-code.png
Binary files differ
diff --git a/content/go-fonts/go-font-greek.png b/content/go-fonts/go-font-greek.png
index cf0996c..9a86101 100644
--- a/content/go-fonts/go-font-greek.png
+++ b/content/go-fonts/go-font-greek.png
Binary files differ
diff --git a/content/go-fonts/go-font-jabberwocky.png b/content/go-fonts/go-font-jabberwocky.png
index 172ca55..46386f2 100644
--- a/content/go-fonts/go-font-jabberwocky.png
+++ b/content/go-fonts/go-font-jabberwocky.png
Binary files differ
diff --git a/content/go-fonts/go-mono.png b/content/go-fonts/go-mono.png
index 6e75121..e6ca797 100644
--- a/content/go-fonts/go-mono.png
+++ b/content/go-fonts/go-mono.png
Binary files differ
diff --git a/content/go-fonts/go-regular.png b/content/go-fonts/go-regular.png
index f41a257..d4ab399 100644
--- a/content/go-fonts/go-regular.png
+++ b/content/go-fonts/go-regular.png
Binary files differ