Say who is playing, what you can press, and where you are in the Stage

Mostly presentation, plus one rules fix found on the way.

src/web/index.html

@@ -33,7 +33,7 @@ footer{margin-top:26px;color:var(--dim);font-size:11px;display:flex;gap:18px;fle
 <body>
 <main>
   <h1>Station Master</h1>
-  <p class="tag">Timetable-and-train-order railroading, 1840&ndash;1950.</p>
+  <p class="tag">TimeTable and Train Order (TT&amp;TO) railroading, 1840&ndash;1950.</p>
 
   <svg class="trackline" viewBox="0 0 700 24" preserveAspectRatio="none" aria-hidden="true">
     <line class="rail" x1="0" y1="10" x2="700" y2="10"/>
@@ -42,24 +42,27 @@ footer{margin-top:26px;color:var(--dim);font-size:11px;display:flex;gap:18px;fle
   </svg>
 
   <p class="blurb">
-    You run a division: a Running Track between your Limits, a district of industries hanging beneath
-    it, and trains that arrive whether or not you are ready for them. Spot the right cars, work the
-    loads, and get every train away again &mdash; a train with nowhere to stand is a collision, and a
+    As Station Master in your line-side office, you manage the town's railroad connection. You are
+    responsible for all track between your Limits, a district of industries hanging beneath it, and
+    trains that arrive whether or not you are ready for them. Spot the right cars, work the loads,
+    and get every train away again &mdash; a train with nowhere to stand is a collision, and a
     collision costs more than the freight was worth.
   </p>
 
   <div class="doors">
     <a class="door" href="./play.html">
       <h2>Play solitaire</h2>
-      <p>Five Days, twelve Stages each, and a target of 20 Revenue. Your game saves in this browser,
-         so you can close the tab and come back to it.</p>
+      <p>Play by yourself and run the entire division for five full days. Your goal is 20 Revenue.
+         Your game data is saved in your browser &mdash; if you close the tab and reopen this site
+         without clearing your cache, your game is preserved and you can continue automatically.
+         During the game you can also explicitly save your progress for later replay.</p>
       <span class="go">Start a game &rarr;</span>
     </a>
 
     <a class="door" href="./replays.html">
       <h2>Replays</h2>
-      <p>Watch a finished game back, Stage by Stage. Open one saved on this site, or a save file
-         somebody has sent you.</p>
+      <p>Replay a saved game, step by step or advancing automatically through phases, Stages and
+         Days. Open one saved on the site, or a saved file that someone has sent you.</p>
       <span class="go">Browse replays &rarr;</span>
     </a>
   </div>
@@ -68,7 +71,7 @@ footer{margin-top:26px;color:var(--dim);font-size:11px;display:flex;gap:18px;fle
 
   <footer>
     <span>build <span id="build">__BUILD__</span></span>
-    <span>runs entirely in your browser &mdash; nothing is sent anywhere</span>
+    <span>runs entirely in your browser &mdash; no server code required</span>
   </footer>
 </main>