Update SVGs to have fallback text

icons/moon.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="currentColor"><g><path d="M0,0h24v24H0V0z" fill="none"/></g><g><path d="M9.5,2c-1.82,0-3.53,0.5-5,1.35c2.99,1.73,5,4.95,5,8.65s-2.01,6.92-5,8.65C5.97,21.5,7.68,22,9.5,22c5.52,0,10-4.48,10-10 S15.02,2,9.5,2z"/></g></svg>
+<svg xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="currentColor">Dark Mode<g><path d="M0,0h24v24H0V0z" fill="none"/></g><g><path d="M9.5,2c-1.82,0-3.53,0.5-5,1.35c2.99,1.73,5,4.95,5,8.65s-2.01,6.92-5,8.65C5.97,21.5,7.68,22,9.5,22c5.52,0,10-4.48,10-10 S15.02,2,9.5,2z"/></g></svg>

icons/rss.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"/><circle cx="6.18" cy="17.82" r="2.18"/><path d="M4 4.44v2.83c7.03 0 12.73 5.7 12.73 12.73h2.83c0-8.59-6.97-15.56-15.56-15.56zm0 5.66v2.83c3.9 0 7.07 3.17 7.07 7.07h2.83c0-5.47-4.43-9.9-9.9-9.9z"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="currentColor">RSS Feed<path d="M0 0h24v24H0z" fill="none"/><circle cx="6.18" cy="17.82" r="2.18"/><path d="M4 4.44v2.83c7.03 0 12.73 5.7 12.73 12.73h2.83c0-8.59-6.97-15.56-15.56-15.56zm0 5.66v2.83c3.9 0 7.07 3.17 7.07 7.07h2.83c0-5.47-4.43-9.9-9.9-9.9z"/></svg>