small tweaks

about/index.html

@@ -34,11 +34,11 @@
       <main>
         <h1>About the Beall Greenhouses</h1>
 
-        <h2>Past</h2>
+        <h2 id="past">Past</h2>
 
-        <h2>Present</h2>
+        <h2 id="present">Present</h2>
 
-        <h2>Future</h2>
+        <h2 id="future">Future</h2>
       </main>
     </div>
     <footer id="footer"><!-- auto-populated by nav.js --></footer>