Design: Configure Iosevka with discretionary ligatures.

Change-Id: Ie4b2f9481c786e4dc5a6f35d379ec36f529cee46
diff --git a/src/main/resources/META-INF/resources/cms2/base.css b/src/main/resources/META-INF/resources/cms2/base.css
index 8ff1836..70d164c 100644
--- a/src/main/resources/META-INF/resources/cms2/base.css
+++ b/src/main/resources/META-INF/resources/cms2/base.css
@@ -48,7 +48,8 @@
 }
 
 code, kbd, samp, pre {
-  font-family: 'Iosevka Web', monospace;
+  font-family: 'Iosevka Web', 'Source Code Pro', 'Fira Code', 'Fira Mono', monospace;
+  font-feature-settings: "calt" off, "dlig" on;
 }
 
 body {