Add root-wood mark to the site header

Traced from a piece of petrified root wood the user owns, simplified into
a flat currentColor SVG so it matches the header text in both light and
dark mode, plus a bio line explaining the connection.

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

assets/css/main.css

@@ -107,12 +107,20 @@ header.site .inner {
   flex-wrap: wrap;
 }
 header.site .brand {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
   font-family: var(--font-heading);
   font-weight: 700;
   font-size: 1.1rem;
   color: var(--bg);
   text-decoration: none;
 }
+header.site .brand svg {
+  height: 28px;
+  width: auto;
+  display: block;
+}
 header.site nav {
   display: flex;
   gap: 1.5rem;

assets/images/reground-root.svg

@@ -0,0 +1,21 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 978 207" role="img" aria-hidden="true">
+<g transform="translate(0,207) scale(0.1,-0.1)" fill="currentColor" stroke="none">
+<path d="M3470 1989 c-213 -19 -348 -59 -575 -170 -263 -127 -460 -178 -880
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+-530 -91 -214 -30 -490 -30 -673 1 -255 43 -347 72 -758 238 -171 70 -342 129
+-749 258 -628 199 -808 232 -1110 204z"/>
+</g>
+</svg>