fix more broken markdown links

Fixed stuff we broke by mistake, previously.

Ran `make www` to perform the above.

TODO: Fix stuff we broke by mistake doing the above.

TODO: Fix more broken markdown links.

2020/ferguson1/gameplay.html

@@ -401,12 +401,12 @@ for the input keys.</p>
 <ul>
 <li><a href="#warning"><strong>Photosensitive epilepsy/Stimulation overload trigger warnings</strong></a></li>
 <li><a href="#drawing">Drawing / Practice mode</a></li>
-<li><a href="#auto">Computer playing / Automatic mode (<strong>Photosensitive epilepsy/Stimulation overload trigger</strong>)</a>
+<li><a href="#auto">Computer playing / Automatic mode (Photosensitive epilepsy/Stimulation overload trigger)</a>
 <ul>
 <li><a href="#auto-variations">Variations</a></li>
 </ul></li>
 <li><a href="#grow-shrink">Grow-Shrink (Positive/Negative Winning) mode</a></li>
-<li><a href="#hypnotic">Hypnotic / Sleepy mode (<strong>Photosensitive epilepsy/Stimulation overload trigger</strong>)</a></li>
+<li><a href="#hypnotic">Hypnotic / Sleepy mode (Photosensitive epilepsy/Stimulation overload trigger)</a></li>
 <li><a href="#stim">Stimulation / Calming mode</a></li>
 <li><a href="#other-ideas">Other ideas</a></li>
 </ul></li>
@@ -901,7 +901,7 @@ also has this mode:</p>
 of them (the above is option 5; others are 4, 15 and 16 but only options 4 and 5
 are called Grow / Shrink).</p>
 <div id="hypnotic">
-<h2 id="hypnotic-sleepy-mode-photosensitive-epilepsystimulation-overload-trigger"><a href="#toc">Hypnotic / Sleepy mode (<strong>Photosensitive epilepsy/Stimulation overload trigger</strong>)</a></h2>
+<h2 id="hypnotic-sleepy-mode-photosensitive-epilepsystimulation-overload-trigger"><a href="#toc">Hypnotic / Sleepy mode (Photosensitive epilepsy/Stimulation overload trigger)</a></h2>
 </div>
 <p><strong>Photosensitive epilepsy/stimulation overload trigger warning:</strong>
 For those who have epilepsy or are susceptible to stimulation overload from