Tweaks to w3m.sh to improve TXT version of docs

Make headers and description terms more apparent, by adding
some more regexps into the `sed` that the HTML is piped through
before being sent to `w3m`.

docs/ja_JP.UTF-8/html/README.html

@@ -102,7 +102,7 @@
           </p>
 
           <p>
-            2024年10月12日          </p>
+            2024年10月14日          </p>
         </center>
       </header>
       <table border="2"
@@ -232,13 +232,13 @@
   <dd>A flood fill option that fills the canvas with the background color, or template or starter background, upon which the drawing was based.</dd>
 
   <dt>ブラシの追加</dt>
-  <dd>New brushes for the Paint and Lines tools: "Fluff (gradient)", "Graphite", "Paint splats", "Smoke", "Spines", "Water (still)", and "Watercolor splotches".</dt>
+  <dd>New brushes for the Paint and Lines tools: "Fluff (gradient)", "Graphite", "Paint splats", "Smoke", "Spines", "Water (still)", and "Watercolor splotches".</dd>
 
   <dt>New brush option</dt>
-  <dd>Brushes may be given a "chaotic" setting, causing them to rotate continuously while drawing with them.</dt>
+  <dd>Brushes may be given a "chaotic" setting, causing them to rotate continuously while drawing with them.</dd>
 
   <dt>New templates</dt>
-  <dd>"Clouds from an airplane" and "Lough Leane".</dt>
+  <dd>"Clouds from an airplane" and "Lough Leane".</dd>
 
   <dt>New Magic tool: Comic dots</dt>
   <dd>Draws a repeating dot pattern, simulating the "Ben Day process" used in early comic books.</dd>
@@ -250,37 +250,37 @@
   <dd>A set of tools that recursively repeat what you draw, scaling and/or rotating it as they repeat.</dd>
 
   <dt>New Magic tool: ASCII Typewriter</dt>
-  <dd>Transform your picture into "ASCII art", typewriter-style.</dt>
+  <dd>Transform your picture into "ASCII art", typewriter-style.</dd>
 
   <dt>New Magic tool: ASCII Computer</dt>
-  <dd>Transform your picture into "ASCII art", computer-style.</dt>
+  <dd>Transform your picture into "ASCII art", computer-style.</dd>
 
   <dt>New Magic tool: ASCII Color Computer</dt>
-  <dd>Transform your picture into colored computer "ASCII art".</dt>
+  <dd>Transform your picture into colored computer "ASCII art".</dd>
 
   <dt>New Magic tool: Crescent</dt>
-  <dd>Draw one of various crescent shapes at a chosen angle.</dt>
+  <dd>Draw one of various crescent shapes at a chosen angle.</dd>
 
   <dt>New Magic tool: Spiral</dt>
-  <dd>Draw spirals.</dt>
+  <dd>Draw spirals.</dd>
 
   <dt>New Magic tool: Spiral Square</dt>
-  <dd>Draw square spirals.</dt>
+  <dd>Draw square spirals.</dd>
 
   <dt>New Magic tool: Concentric Circle</dt>
-  <dd>Draw concentric circles.</dt>
+  <dd>Draw concentric circles.</dd>
 
   <dt>New Magic tool: Concentric Square</dt>
-  <dd>Draw concentric squares.</dt>
+  <dd>Draw concentric squares.</dd>
 
   <dt>New Magic tool: Tessellation Pointy</dt>
-  <dd>Draw repeating tessellation patterns with pointy-topped hexagons.</dt>
+  <dd>Draw repeating tessellation patterns with pointy-topped hexagons.</dd>
 
   <dt>New Magic tool: Tessellation Flat</dt>
-  <dd>Draw repeating tessellation patterns with flat-topped hexagons.</dt>
+  <dd>Draw repeating tessellation patterns with flat-topped hexagons.</dd>
 
   <dt>Magic API Updates</dt>
-  <dd>Sound pause and resume functions added.</dt>
+  <dd>Sound pause and resume functions added.</dd>
 </dl>
 
     <p>
@@ -378,6 +378,7 @@
            width="324"
            height="254"
            alt="[起動画面]">
+        <span style="display: none;"><br/>&nbsp;</span>
       </div>
       <h2 id="using_title">
         B. 起動画面      </h2>
@@ -412,6 +413,7 @@
            height="254"
            alt=
            "[どうぐ: ふで, はんこ, せん, かたち, もじ, まほう, ラベル, とりけし, やりなおし, けしゴム, さいしょから, ひらく, セーブ, いんさつ, やめる]">
+        <span style="display: none;"><br/>&nbsp;</span>
       </div>
       <dt>
         <strong>左側: ツールバー「どうぐ」</strong>
@@ -431,6 +433,7 @@
            width="324"
            height="254"
            alt="[描画キャンバス]">
+        <span style="display: none;"><br/>&nbsp;</span>
       </div>
 
       <dt>
@@ -455,6 +458,7 @@
            height="254"
            alt=
            "[セレクタ - ふで、もじ、かたち、はんこ]">
+        <span style="display: none;"><br/>&nbsp;</span>
       </div>
 
       <dt>
@@ -476,6 +480,7 @@
            height="254"
            alt=
            "[いろ - いろ - くろ、しろ、あか、ぴんく、おれんじ、きいろ、みどり、みずいろ、あお、むらさき、ちゃいろ、はいいろ]">
+        <span style="display: none;"><br/>&nbsp;</span>
       </div>
 
       <dt>
@@ -486,13 +491,14 @@
         <p>
           使用中のツールが色をサポートしている場合、画面の下部付近に色の選択肢がパレットで表示されます。このパレットをクリックして色を選択すると、その色がツールで使用されます。(例えば、「ふで」ツールでは選択したブラシで描く色として、「ぬる」ツールでは画像の領域を塗りつぶす色として使用します)。        </p>
 
-        <div class="screenshot-right-after"></div>
+        <div class="screenshot-right-after">
+          <img src="../../html/images/colors_special.png"
+              width="105"
+              height="48"
+              alt=""
+              align="right">
+        </div>
 
-        <img src="../../html/images/colors_special.png"
-            width="105"
-            height="48"
-            alt=""
-            align="right">
         <p id="special_color_options">
           右端には色に関する3つの特別なオプションがあります。          <ul>
             <li>
@@ -544,6 +550,7 @@
            height="254"
            alt=
            "(「かたち」ツールの使い方を説明している例)">
+        <span style="display: none;"><br/>&nbsp;</span>
       </div>
 
       <dt>