ui: make pixel sizes correct, use more of the figma

I noticed the pixel sizes were off which made it harder to match the
pixel dimensions of rob's figma designs. This restores the pixel size
and adjust the font sizes so that things look somewhat ok with the
default pixel settings.

Signed-off-by: William Casarin <jb55@jb55.com>

src/imgcache.rs

@@ -25,6 +25,10 @@ impl ImageCache {
         }
     }
 
+    pub fn rel_datadir() -> &'static str {
+        "cache/img"
+    }
+
     pub fn write(cache_dir: &path::Path, url: &str, data: ColorImage) -> Result<()> {
         let file_path = cache_dir.join(Self::key(url));
         let file = File::options()