website: adjustments to "using" after #497 (and update jekyll script while at it)

docs/.gitignore

@@ -1,3 +1,4 @@
 /.jekyll*
+/.ruby*
 /_site
 /lab/fonts

docs/Gemfile

@@ -32,4 +32,6 @@ gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
 # do not have a Java counterpart.
 gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
 
-gem "webrick", "~> 1.7"
+gem "jekyll-redirect-from"
+
+gem "webrick"

docs/Gemfile.lock

@@ -1,8 +1,8 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.10)
     em-websocket (0.5.3)
@@ -12,7 +12,7 @@ GEM
     ffi (1.15.5)
     forwardable-extended (2.6.0)
     http_parser.rb (0.8.0)
-    i18n (1.10.0)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     jekyll (4.2.2)
       addressable (~> 2.4)
@@ -31,6 +31,8 @@ GEM
       terminal-table (~> 2.0)
     jekyll-feed (0.16.0)
       jekyll (>= 3.7, < 5.0)
+    jekyll-redirect-from (0.16.0)
+      jekyll (>= 3.3, < 5.0)
     jekyll-sass-converter (2.2.0)
       sassc (> 2.0.1, < 3.0)
     jekyll-seo-tag (2.8.0)
@@ -52,12 +54,12 @@ GEM
       jekyll-seo-tag (~> 2.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.7)
-    rb-fsevent (0.11.1)
+    public_suffix (5.0.0)
+    rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.28.0)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -67,17 +69,18 @@ GEM
     webrick (1.7.0)
 
 PLATFORMS
-  arm64-darwin-21
+  x86_64-darwin-19
 
 DEPENDENCIES
   http_parser.rb (~> 0.6.0)
   jekyll (~> 4.2.2)
   jekyll-feed (~> 0.12)
+  jekyll-redirect-from
   minima (~> 2.5)
   tzinfo (~> 1.2)
   tzinfo-data
   wdm (~> 0.1.1)
-  webrick (~> 1.7)
+  webrick
 
 BUNDLED WITH
-   2.3.14
+   2.3.22

docs/Makefile

@@ -6,13 +6,22 @@ export PATH := $(BIN):$(PATH)
 default:
 	@echo "Please specify a target: build, serve or dist" >&2
 
-build:
+build: .ruby-bundle
 	rm -rf _site
 	bundle exec jekyll build
 
-serve:
+serve: .ruby-bundle
 	./_scripts/serve.sh
 
+.ruby-bundle: Gemfile Gemfile.lock
+	@if ! (command -v bundle >/dev/null && command -v jekyll >/dev/null); then \
+	  echo "Please install Ruby bundle and jekyll: gem install bundler jekyll" >&2; \
+	  exit 1; \
+	fi
+	bundle update
+	bundle install
+	touch .ruby-bundle
+
 # -----------------------------------------------------------------------
 
 dist: fonts info

docs/_includes/preload-font-files.html

@@ -5,5 +5,5 @@ assign url_root = "/" %}{% else %}{%
 assign url_root = "/inter/" %}{% endif %}{%
 assign font_v = site.data.fontinfo[0].version
 
-%}<link rel="preload" href="{{url_root}}font-files/Inter-roman.latin.var.woff2?v={{font_v}}" as="font" type="font/woff2" crossorigin="anonymous">
-    <link rel="preload" href="{{url_root}}font-files/Inter-italic.latin.var.woff2?v={{font_v}}" as="font" type="font/woff2" crossorigin="anonymous">
+%}<link rel="preload" href="{{url_root}}font-files/Inter-roman.var.woff2?v={{font_v}}" as="font" type="font/woff2" crossorigin="anonymous">
+    <link rel="preload" href="{{url_root}}font-files/Inter-italic.var.woff2?v={{font_v}}" as="font" type="font/woff2" crossorigin="anonymous">

docs/index.html

@@ -84,19 +84,17 @@ endfor
       <p>
         Using Inter is as easy as
         <a class="download-link" href="download/">downloading &amp; installing</a>
-        the font files. If you're making a web thing, you can use the following CSS.
-        <!-- or get it from <a href="https://fonts.google.com/specimen/Inter">Google Fonts</a>. -->
+        the font files.<br>
+        If you're making a web thing, you can use the following HTML and CSS:
       </p>
-      <pre>&lt;link rel=&quot;preconnect&quot; href=&quot;https://rsms.me/&quot;&gt;
-&lt;link rel=&quot;stylesheet&quot; href=&quot;https://rsms.me/inter/inter.css&quot;&gt;</pre>
-      <pre>html {
-  font-family: 'Inter', sans-serif;
-}
+      <pre>&lt;!-- HTML in your document's head --&gt;
+&lt;link rel=&quot;preconnect&quot; href=&quot;https://rsms.me/&quot;&gt;
+&lt;link rel=&quot;stylesheet&quot; href=&quot;https://rsms.me/inter/inter.css&quot;&gt;
 
+/* CSS */
+:root { font-family: 'Inter', sans-serif; }
 @supports (font-variation-settings: normal) {
-  html {
-    font-family: 'Inter var', sans-serif;
-  }
+  :root { font-family: 'Inter var', sans-serif; }
 }</pre>
     </c>