fix: drop casing; absolutely ensure gtk.css and gtk-dark.css are the same

As we make use of release-please, I feel like it's
nicer to hardcode the versions as they will
automatically get updated upon release.

README.md

@@ -31,7 +31,7 @@ We provide a Python script to automate the process of installing the theme:
 <!-- x-release-please-start-version -->
 
 ```bash
-curl -LsS "https://raw.githubusercontent.com/catppuccin/gtk/main/install.py" -o install.py
+curl -LsSO "https://raw.githubusercontent.com/catppuccin/gtk/v1.0.2/install.py"
 python3 install.py <flavor> <accent>
   [catppuccin-gtk] [INFO] - Installation info:
       flavor:     mocha
@@ -103,7 +103,7 @@ sudo flatpak override --env=GTK_THEME="catppuccin-${FLAVOR}-${ACCENT}-standard+d
 
 ### Manual installation
 
-If your distro does not package our theme, and the installation script will not work for your use case, you can pull down releases and extract them yourself. You can find the [latest release on GitHub](https://github.com/catppuccin/gtk/releases/latest).
+If your distro does not package our theme, and the installation script will not work for your use case, you can pull down releases and extract them yourself. You can find the [latest release on GitHub](https://github.com/catppuccin/gtk/releases/tag/v1.0.2).
 
 ```bash
 cd ~/.local/share/themes

build.py

@@ -55,10 +55,7 @@ class BuildContext:
     tweaks: Tweaks
 
     def output_dir(self) -> str:
-        suffix = "light"
-        if self.flavor.dark:
-            suffix = "dark"
-        return f"{self.build_root}/{self.build_id()}-{suffix}"
+        return f"{self.build_root}/{self.build_id()}"
 
     def build_id(self) -> str:
         return f"{self.theme_name}-{self.flavor.identifier}-{self.accent.identifier}-{self.size}+{self.tweaks.id() or 'default'}"
@@ -118,8 +115,7 @@ def build(ctx: BuildContext):
         [
             "sassc",
             *SASSC_OPT,
-            # NOTE: This uses 'Dark' for the source, but 'dark' for the destination. This is intentional. Do !!NOT!! change it without consultation
-            f"{SRC_DIR}/main/gtk-3.0/gtk-Dark.scss",
+            f"{SRC_DIR}/main/gtk-3.0/gtk{ctx.apply_suffix(DARK_LIGHT)}.scss",
             f"{output_dir}/gtk-3.0/gtk-dark.css",
         ]
     )
@@ -137,8 +133,7 @@ def build(ctx: BuildContext):
         [
             "sassc",
             *SASSC_OPT,
-            # NOTE: This uses 'Dark' for the source, but 'dark' for the destination. This is intentional. Do !!NOT!! change it without consultation
-            f"{SRC_DIR}/main/gtk-4.0/gtk-Dark.scss",
+            f"{SRC_DIR}/main/gtk-4.0/gtk{ctx.apply_suffix(DARK_LIGHT)}.scss",
             f"{output_dir}/gtk-4.0/gtk-dark.css",
         ]
     )