feat: domain-based branding (humorunits.com / dickloads.com)

- src/lib/brand.ts: Brand config map, getBrand() reads hostname server-side
- src/routes/+layout.server.ts: new, passes brand to layout
- +layout.svelte: site name and footer driven by brand config
- humorunits.com footer: 'invented conversions for ridiculous people'
- dickloads.com footer: placeholder (pending Shannon's pick)

data/units.json

@@ -20,7 +20,7 @@
       "id": "barrel",
       "label": "Barrel",
       "labelPlural": "Barrels",
-      "symbol": "dlbbl",
+      "symbol": "bbl",
       "group": "dickloads",
       "toBase": 19
     },
@@ -28,18 +28,10 @@
       "id": "hogshead",
       "label": "Hogshead",
       "labelPlural": "Hogsheads",
-      "symbol": "dlhhd",
+      "symbol": "hhd",
       "group": "dickloads",
       "toBase": 38
     },
-    {
-      "id": "assload",
-      "label": "Assload",
-      "labelPlural": "Assloads",
-      "symbol": "assl",
-      "group": "dickloads",
-      "toBase": 2
-    },
     {
       "id": "short-ton",
       "label": "Short ton",
@@ -48,14 +40,6 @@
       "group": "dickloads",
       "toBase": 76
     },
-    {
-      "id": "long-ton",
-      "label": "Long ton",
-      "labelPlural": "Long tons",
-      "symbol": "long tn",
-      "group": "dickloads",
-      "toBase": 85.1199999999
-    },
     {
       "id": "fuckton",
       "label": "Fuck ton",
@@ -64,6 +48,14 @@
       "group": "dickloads",
       "toBase": 152
     },
+    {
+      "id": "long-ton",
+      "label": "Long ton",
+      "labelPlural": "Long tons",
+      "symbol": "long tn",
+      "group": "dickloads",
+      "toBase": 85.1199999999
+    },
     {
       "id": "metric-fuckton",
       "label": "Metric fuckton",
@@ -72,6 +64,14 @@
       "group": "dickloads",
       "toBase": 170.2399999998
     },
+    {
+      "id": "assload",
+      "label": "Assload",
+      "labelPlural": "Assloads",
+      "symbol": "assl",
+      "group": "dickloads",
+      "toBase": 2
+    },
     {
       "id": "shitload",
       "label": "Shitload",