Update readme and tweak spec rationale

README.txt

@@ -4,9 +4,9 @@
 This is my custom keyboard layout. For the full spec, rationale, and images,
 please see the spec file at the URL below:
 
-   https://acperkins.github.io/keyboard/spec.html
+   https://acperkins.com/acp/keyboard/src/branch/main/spec.html
 
 To download the Windows AutoHotKey build, see the GitHub Releases page at the
 URL below:
 
-   https://github.com/acperkins/keyboard/releases
+   https://acperkins.com/acp/keyboard/releases/latest

spec.html

@@ -61,13 +61,14 @@
     <h2 id="rationale">Rationale</h2>
 
     <p>There are thousands of keyboard layouts around. Why make a new one?
-    Simply: none of them worked for me. They either had too many symbols,
-    not enough symbols, or the layout was wrong. <a
+    Simply: none of them worked for me. They either had too many symbols, not
+    enough symbols, or the layout was wrong. <a
     href="https://bepo.fr/wiki/Accueil">BÉPO</a> came the closest to having the
-    main symbols I wanted, but I couldn’t get over the non-QWERTY layout; and
-    the <a href="https://kbdlayout.info/kbdcan">Canadian Multilingual
-    Standard</a> layout had the symbols I wanted, but they were spread across
-    six levels (AltGr and Right Ctrl both act as level selectors).
+    main symbols I wanted, but I couldn&#x2019;t get over the non-QWERTY
+    layout; and the <a href="https://kbdlayout.info/kbdcan">Canadian
+    Multilingual Standard</a> layout had the symbols I wanted, but they were
+    spread across six levels (AltGr and Right Ctrl both act as level
+    selectors).
 
     <p>So I made my own. There were a number of requirements for me:</p>