FIX: Add 700 weight variant for Inter (#13)

Followup  5be751e

In the previous commit we added Inter as a font
selection, but at the time since it was variable weight
we didn't add a 700 weight variant out of concern for
other issues that may arise from this.

However leaving it out has had actual real-world issues,
whether the bold variation does not render correctly in
some browsers (e.g. Chrome on macOS). Adding the 700 weight
here fixes that issue.

lib/discourse_fonts.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 module DiscourseFonts
-  VERSION = "0.0.12"
+  VERSION = "0.0.13"
 
   def self.path_for_fonts
     File.expand_path("../../vendor/assets/fonts", __FILE__)
@@ -55,7 +55,11 @@ def self.fonts
         {
           name: "Inter",
           stack: "Inter, Arial, sans-serif",
-          variants: [{ filename: "Inter.ttf", format: "truetype", weight: 400 }]
+          # Inter is variable font, so the same .ttf file is used for all weights.
+          variants: [
+            { filename: "Inter.ttf", format: "truetype", weight: 400 },
+            { filename: "Inter.ttf", format: "truetype", weight: 700 }
+          ]
         },
         {
           name: "NotoSansJP",