Simplify homepage to a data-free markdown body with headshot

Replaces the hero_heading/subheading/intro param-driven layout with a
plain markdown body (headshot, Creative Help, Technical Help, bio), so
layouts/index.html just renders .Content. Headshot is served from the
Linode bucket (same convention as the freebie PDF) rather than
committed to git. CSS floats the photo left with the first list
wrapping beside it, matching the site's font/color patterns.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

assets/css/main.css

@@ -303,3 +303,25 @@ input:focus, textarea:focus {
   text-align: center;
   margin-top: 3rem;
 }
+
+/* Home page: hero photo floats left, first list wraps beside it, second
+   section clears below once the photo's height runs out. */
+main img {
+  float: left;
+  width: 220px;
+  height: auto;
+  margin: 0 1.5rem 1rem 0;
+  border-radius: var(--radius);
+}
+main h2:nth-of-type(2) {
+  clear: left;
+}
+@media (max-width: 30rem) {
+  main img {
+    float: none;
+    width: 100%;
+    max-width: 220px;
+    margin: 0 auto 1.5rem;
+    display: block;
+  }
+}