Introduce favicon

[nlisgo]

From Figma: https://www.figma.com/design/49KLtiUClWILNZoRcRynid/Pathways-site-and-brand?node-id=1251-1582&t=UutV3heCrTQZDPZ0-4

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" fill="none">
<style>
  .fav-light { display: block; }
  .fav-dark  { display: none; }
  @media (prefers-color-scheme: dark) {
    .fav-light { display: none; }
    .fav-dark  { display: block; }
  }
</style>
<defs>
<linearGradient id="fav-light" x1="8" y1="1" x2="8" y2="15" gradientUnits="userSpaceOnUse">
<stop stop-color="#FFE7C5"/>
<stop offset="1" stop-color="#FEE6CD"/>
</linearGradient>
<linearGradient id="fav-dark" x1="8" y1="1" x2="8" y2="15" gradientUnits="userSpaceOnUse">
<stop stop-color="#502D79"/>
<stop offset="1" stop-color="#4F2770"/>
</linearGradient>
</defs>
<g class="fav-light">
<rect x="1" y="1" width="14" height="14" rx="1" fill="url(#fav-light)"/>
<path d="M11 6.09456C11 6.62942 10.8762 7.13085 10.6287 7.59885C10.3903 8.06686 10.0098 8.44413 9.48723 8.73066C8.9738 9.01719 8.32286 9.16046 7.53438 9.16046H5.92534V13H4V3H7.53438C8.27701 3 8.90963 3.13372 9.43222 3.40115C9.95481 3.66858 10.3445 4.03629 10.6012 4.5043C10.8671 4.9723 11 5.50239 11 6.09456ZM7.45187 7.54155C7.98363 7.54155 8.37787 7.41738 8.63458 7.16905C8.89129 6.91117 9.01965 6.55301 9.01965 6.09456C9.01965 5.12034 8.49705 4.63324 7.45187 4.63324H5.92534V7.54155H7.45187Z" fill="#440535"/>
<path d="M11.5103 13C11.0828 13 10.7241 12.8562 10.4345 12.5685C10.1448 12.2808 10 11.9247 10 11.5C10 11.0753 10.1448 10.7192 10.4345 10.4315C10.7241 10.1438 11.0828 10 11.5103 10C11.9241 10 12.2759 10.1438 12.5655 10.4315C12.8552 10.7192 13 11.0753 13 11.5C13 11.9247 12.8552 12.2808 12.5655 12.5685C12.2759 12.8562 11.9241 13 11.5103 13Z" fill="#D71D62"/>
</g>
<g class="fav-dark">
<rect x="1" y="1" width="14" height="14" rx="1" fill="url(#fav-dark)"/>
<path d="M11 6.09456C11 6.62942 10.8762 7.13085 10.6287 7.59885C10.3903 8.06686 10.0098 8.44413 9.48723 8.73066C8.9738 9.01719 8.32286 9.16046 7.53438 9.16046H5.92534V13H4V3H7.53438C8.27701 3 8.90963 3.13372 9.43222 3.40115C9.95481 3.66858 10.3445 4.03629 10.6012 4.5043C10.8671 4.9723 11 5.50239 11 6.09456ZM7.45187 7.54155C7.98363 7.54155 8.37787 7.41738 8.63458 7.16905C8.89129 6.91117 9.01965 6.55301 9.01965 6.09456C9.01965 5.12034 8.49705 4.63324 7.45187 4.63324H5.92534V7.54155H7.45187Z" fill="white"/>
<path d="M11.5103 13C11.0828 13 10.7241 12.8562 10.4345 12.5685C10.1448 12.2808 10 11.9247 10 11.5C10 11.0753 10.1448 10.7192 10.4345 10.4315C10.7241 10.1438 11.0828 10 11.5103 10C11.9241 10 12.2759 10.1438 12.5655 10.4315C12.8552 10.7192 13 11.0753 13 11.5C13 11.9247 12.8552 12.2808 12.5655 12.5685C12.2759 12.8562 11.9241 13 11.5103 13Z" fill="#D71D62"/>
</g>
</svg>