docs: tune performance and theming of documentation (#2164)

* docs: tune performance and theming of documentation

* docs: enable auto-toggle based on user preference

www/docs/overrides/home.html

@@ -18,6 +18,11 @@
 		display: none
 	}
 
+	[data-md-color-scheme=slate] .tx-container {
+		padding-top: 1rem;
+		background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1123 258'><path d='M1124,2c0,0 0,256 0,256l-1125,0l0,-48c0,0 16,5 55,5c116,0 197,-92 325,-92c121,0 114,46 254,46c140,0 214,-167 572,-166Z' style='fill: hsla(232, 15%, 21%, 1)'/></svg>") no-repeat bottom, linear-gradient(to bottom, var(--md-primary-fg-color), var(--goreleaser-primary-color) 99%, #fff 99%)
+	}
+
 	.tx-container {
 		padding-top: 1rem;
 		background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1123 258'><path d='M1124,2c0,0 0,256 0,256l-1125,0l0,-48c0,0 16,5 55,5c116,0 197,-92 325,-92c121,0 114,46 254,46c140,0 214,-167 572,-166Z' style='fill: white' /></svg>") no-repeat bottom, linear-gradient(to bottom, var(--md-primary-fg-color), var(--goreleaser-primary-color) 99%, #fff 99%)

www/mkdocs.yml

@@ -1,4 +1,5 @@
 site_name: GoReleaser
+site_url: https://goreleaser.com
 site_description: Deliver Go binaries as fast and easily as possible
 copyright: Made with ❤️ by GoReleaser contributors.
 repo_name: goreleaser/goreleaser
@@ -13,6 +14,19 @@ theme:
   favicon: static/favicon.ico
   include_search_page: false
   search_index_only: true
+  features:
+    - navigation.instant
+  palette:
+    - media: "(prefers-color-scheme: light)"  # Light mode
+      scheme: default
+      toggle:
+        icon: material/lightbulb-outline
+        name: Switch to light mode
+    - media: "(prefers-color-scheme: dark)"  # Dark mode
+      scheme: slate
+      toggle:
+        icon: material/lightbulb
+        name: Switch to dark mode
 
 plugins:
   # disable temporarely because its freezing the page
@@ -23,7 +37,6 @@ plugins:
   - minify:
       minify_html: true
 
-
 extra:
   social:
     - icon: fontawesome/brands/github-alt