Bundle and use Inconsolata v2.012

There's a newer version of the font available but ligatures seem
broken googlefonts/Inconsolata#58 and googlefonts/Inconsolata#52.

As part of this commit I also upgraded rust-embed to use the new
exclusion feature, which allows us to skip embedding OS files like
`.DS_Store`.

zed/assets/themes/dark.toml

@@ -6,7 +6,7 @@ extends = "_base"
 2 = "#131415"
 
 [text]
-base = { family = "Helvetica", size = 14.0 }
+base = { family = "Inconsolata", size = 14 }
 0 = { extends = "$text.base", color = "#ffffff" }
 1 = { extends = "$text.base", color = "#b3b3b3" }
 2 = { extends = "$text.base", color = "#7b7d80" }

zed/assets/themes/light.toml

@@ -7,7 +7,7 @@ extends = "_base"
 3 = "#3a3b3c"
 
 [text]
-base = { family = "Helvetica", size = 14.0 }
+base = { family = "Inconsolata", size = 14 }
 0 = { extends = "$text.base", color = "#acacac" }
 1 = { extends = "$text.base", color = "#111111" }
 2 = { extends = "$text.base", color = "#333333" }