use CSS hex notation for colors in chronicles themes [no ci]

examples/chronicles-dark-theme.yml

@@ -1,69 +1,69 @@
 # invoke with -a pdf-theme=chronicles-dark -a rouge-style=molokai
 extends: chronicles
 page:
-  background-color: 000000
+  background-color: #000000
 base:
-  font-color: CCCCCC
-  border-color: 111111
+  font-color: #CCCCCC
+  border-color: #111111
 link:
-  font-color: BD7435
+  font-color: #BD7435
 codespan:
-  font-color: 4EDEB9
+  font-color: #4EDEB9
 mark:
-  background-color: 0000FF
+  background-color: #0000FF
 kbd:
-  background-color: 0A0A0A
-  border-color: 333333
+  background-color: #0A0A0A
+  border-color: #333333
 heading:
   font-color: $base-font-color
 title-page:
   title:
-    font-color: 666666
+    font-color: #666666
   authors:
-    font-color: E7E7E7
+    font-color: #E7E7E7
 abstract:
-  font-color: A39D99
+  font-color: #A39D99
 admonition:
   column-rule-color: $base-border-color
   icon:
     caution:
-      stroke-color: 40CBFF
+      stroke-color: #40CBFF
     note:
-      stroke-color: E6BF83
+      stroke-color: #E6BF83
     tip:
-      stroke-color: EEEEEE
+      stroke-color: #EEEEEE
     warning:
-      stroke-color: 4096FF
+      stroke-color: #4096FF
 quote:
   border-color: $base-border-color
   cite:
-    font-color: 666666
+    font-color: #666666
 verse:
   border-color: $quote-border-color
   cite:
     font-color: $quote-cite-font-color
 code:
   font-color: $base-font-color
-  background-color: 0A0A0A
-  border-color: 333333
+  background-color: #0A0A0A
+  border-color: #333333
 conum:
   font-color: $codespan-font-color
 example:
   background-color: $page-background-color
   border-color: $base-border-color
 sidebar:
-  background-color: 111111
-  border-color: 1A1A1A
+  background-color: #111111
+  border-color: #1A1A1A
   title:
     font-color: $heading-font-color
 thematic-break:
   border-color: $base-border-color
 table:
   background-color: $page-background-color
-  border-color: 222222
+  border-color: #222222
   foot:
     background-color: $table-background-color
 header:
-  font-color: 666666
+  font-color: #666666
 footer:
-  border-color: 222222
+  border-color: #222222

examples/chronicles-theme.yml

@@ -1,21 +1,21 @@
 extends: default
 role:
   love:
-    font-color: E0245E
+    font-color: #E0245E
   wild:
-    font-color: 222222
+    font-color: #222222
     text-transform: uppercase
     font-style: italic
-    background-color: BCD637
+    background-color: #BCD637
     border-offset: 1.5
 abstract:
   first-line:
     text-transform: smallcaps
 header:
-  font-color: 999999
+  font-color: #999999
   height: 0.5in
   recto:
-    columns: "<40% =20% >40%"
+    columns: '<40% =20% >40%'
     right:
       content: '_{organization}_'
     center: