Add simple icons (#564)

lib/pinchflat_web/components/layouts/partials/sidebar.html.heex

@@ -47,8 +47,9 @@
           text="Docs"
           target="_blank"
           href="https://github.com/kieraneglin/pinchflat/wiki"
+          icon_class="scale-110"
         />
-        <.sidebar_item icon="hero-cog" text="Github" target="_blank" href="https://github.com/kieraneglin/pinchflat" />
+        <.sidebar_item icon="si-github" text="Github" target="_blank" href="https://github.com/kieraneglin/pinchflat" />
         <li>
           <span
             class={[
@@ -59,7 +60,7 @@
             ]}
             phx-click={show_modal("donate-modal")}
           >
-            <.icon name="hero-currency-dollar" /> Donate
+            <.icon name="hero-currency-dollar" class="scale-110" /> Donate
           </span>
         </li>
         <li>