website:fix validation failures

In install option links, and feature comparison
table I fixed aria-labelled-by attribute to correct spelling
aria-labelledby. Fixed time element to have correct datetime attribute,
which translates dates into machine-readable format. Lastly, changed
obsolete tt element, in favor of code element. #335

Author: chuygil

website/public/index.ejs.html

@@ -141,7 +141,10 @@ <h1>quick-lint-js</h1>
       </figure>
 
       <h2>Install quick-lint-js</h2>
-      <p>Latest version: 0.2.0 (beta) (released <time>April 5, 2021</time>)</p>
+      <p>
+        Latest version: 0.2.0 (beta) (released
+        <time datetime="2021-04-05">April 5, 2021</time>)
+      </p>
 
       <ul class="install-options">
         <li>
@@ -150,7 +153,7 @@ <h2>Install quick-lint-js</h2>
               class="install-logo"
               src="gnome-terminal.svg"
               alt=""
-              aria-labeled-by="install-cli"
+              aria-labelledby="install-cli"
             />
             <span id="install-cli">install CLI</span></a
           >
@@ -161,7 +164,7 @@ <h2>Install quick-lint-js</h2>
               class="install-logo"
               src="npm.svg"
               alt=""
-              aria-labeled-by="install-npm"
+              aria-labelledby="install-npm"
             />
             <span id="install-npm">install CLI on npm</span></a
           >
@@ -172,7 +175,7 @@ <h2>Install quick-lint-js</h2>
               class="install-logo"
               src="vim.gif"
               alt=""
-              aria-labeled-by="install-vim"
+              aria-labelledby="install-vim"
             />
             <span id="install-vim">install Vim plugin</span></a
           >
@@ -184,7 +187,7 @@ <h2>Install quick-lint-js</h2>
               class="install-logo"
               src="vscode.png"
               alt=""
-              aria-labeled-by="install-vs-code"
+              aria-labelledby="install-vs-code"
             />
             <span id="install-vs-code">install VS Code plugin</span></a
           >
@@ -210,27 +213,27 @@ <h2 id="linter-feature-comparison">Features</h2>
             <tr>
               <th colspan="2"><a href="benchmarks/">speed</a></th>
               <td class="good quick-lint-js">
-                <span aria-labelled-by="feature-speed-qljs-quick">🚀</span
+                <span aria-labelledby="feature-speed-qljs-quick">🚀</span
                 ><br /><span id="feature-speed-qljs-quick">quick</span>
               </td>
               <td class="meh">
-                <span aria-labelled-by="feature-speed-eslint-capable">🐇</span
+                <span aria-labelledby="feature-speed-eslint-capable">🐇</span
                 ><br /><span id="feature-speed-eslint-capable">capable</span>
               </td>
               <td class="bad">
-                <span aria-labelled-by="feature-speed-jshint-slow">🐢</span
+                <span aria-labelledby="feature-speed-jshint-slow">🐢</span
                 ><br /><span id="feature-speed-jshint-slow">slow</span>
               </td>
               <td class="meh">
-                <span aria-labelled-by="feature-speed-rslint-capable">🐇</span
+                <span aria-labelledby="feature-speed-rslint-capable">🐇</span
                 ><br /><span id="feature-speed-rslint-capable">capable</span>
               </td>
               <td class="bad">
-                <span aria-labelled-by="feature-speed-deno-lint-slow">🐢</span
+                <span aria-labelledby="feature-speed-deno-lint-slow">🐢</span
                 ><br /><span id="feature-speed-deno-lint-slow">slow</span>
               </td>
               <td class="bad">
-                <span aria-labelled-by="feature-speed-rome-slow">🐢</span
+                <span aria-labelledby="feature-speed-rome-slow">🐢</span
                 ><br /><span id="feature-speed-rome-slow">slow</span>
               </td>
             </tr>
@@ -271,7 +274,8 @@ <h2 id="linter-feature-comparison">Features</h2>
                 <span aria-label="easy">✅</span><br />zero config
               </td>
               <td class="meh">
-                <span aria-label="hard">❌</span><br />config or <tt>init</tt>
+                <span aria-label="hard">❌</span><br />config or
+                <code>init</code>
               </td>
               <td class="bad"><span aria-label="hard">❌</span><br />config</td>
               <td class="good">
@@ -281,7 +285,8 @@ <h2 id="linter-feature-comparison">Features</h2>
                 <span aria-label="easy">✅</span><br />zero config
               </td>
               <td class="meh">
-                <span aria-label="hard">❌</span><br />config or <tt>init</tt>
+                <span aria-label="hard">❌</span><br />config or
+                <code>init</code>
               </td>
             </tr>
             <tr>