fix: inline svg icons to follow foreground color

_config.ts

@@ -29,7 +29,11 @@ site.use(djotPlugin({
       symb: (symbol: djot.Symb, renderer: djot.HTMLRenderer) => {
         if (symbol.alias.startsWith("si-")) {
           const iconName = symbol.alias.substring(3);
-          return `<img class="text-icon" src="/icons/${iconName}.svg">`;
+          const decoder = new TextDecoder("utf-8");
+          const svg = decoder.decode(
+            Deno.readFileSync(`./icons/${iconName}.svg`),
+          );
+          return svg;
         }
         return renderer.renderAstNodeDefault(symbol);
       },