feat: add svg version of favicon (#42545)

Adds an SVG version of our logo icon to
`https://supabase.com/favicon/favicon.svg`. Specifically needed for our
upcoming Cursor plugin, which expects a public URL to an SVG version of
our logo. This felt like the best place to put this but happy to move
around if there are other opinions.

SVG file taken from our [brand
assets](https://supabase.com/brand-assets).

### Preview


https://zone-www-dot-com-git-feat-svg-favicon-supabase.vercel.app/favicon/favicon.svg

Co-authored-by: Jonathan Summers-Muir <MildTomato@users.noreply.github.com>

apps/www/public/favicon/favicon.svg

@@ -0,0 +1,15 @@
+<svg width="109" height="113" viewBox="0 0 109 113" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M63.7076 110.284C60.8481 113.885 55.0502 111.912 54.9813 107.314L53.9738 40.0627L99.1935 40.0627C107.384 40.0627 111.952 49.5228 106.859 55.9374L63.7076 110.284Z" fill="url(#paint0_linear)"/>
+<path d="M63.7076 110.284C60.8481 113.885 55.0502 111.912 54.9813 107.314L53.9738 40.0627L99.1935 40.0627C107.384 40.0627 111.952 49.5228 106.859 55.9374L63.7076 110.284Z" fill="url(#paint1_linear)" fill-opacity="0.2"/>
+<path d="M45.317 2.07103C48.1765 -1.53037 53.9745 0.442937 54.0434 5.041L54.4849 72.2922H9.83113C1.64038 72.2922 -2.92775 62.8321 2.1655 56.4175L45.317 2.07103Z" fill="#3ECF8E"/>
+<defs>
+<linearGradient id="paint0_linear" x1="53.9738" y1="54.974" x2="94.1635" y2="71.8295" gradientUnits="userSpaceOnUse">
+<stop stop-color="#249361"/>
+<stop offset="1" stop-color="#3ECF8E"/>
+</linearGradient>
+<linearGradient id="paint1_linear" x1="36.1558" y1="30.578" x2="54.4844" y2="65.0806" gradientUnits="userSpaceOnUse">
+<stop/>
+<stop offset="1" stop-opacity="0"/>
+</linearGradient>
+</defs>
+</svg>