chore: Update footer references to Eleventy instead of GitHub.

Author: arkhi

_src/index.njk

@@ -117,7 +117,7 @@ function isNakedDay()
 				</section>
 
 				<footer>
-					This is CSS Naked Day. This page was generated by <a href="https://pages.github.com/">GitHub Pages</a> (<a href="https://github.com/css-naked-day/css-naked-day.github.io">view it on GitHub</a>). Tactile theme by <a href="https://x.com/jasonlong">Jason Long</a>.
+					This is CSS Naked Day. This page was generated by <a href="https://11ty.dev/">Eleventy</a> (<a href="https://github.com/css-naked-day/css-naked-day.github.io">view it on GitHub</a>). Tactile theme by <a href="https://x.com/jasonlong">Jason Long</a>.
 				</footer>
 			</div>
 		</div>

_src/year.njk

@@ -68,7 +68,7 @@
 				</section>
 
 				<footer>
-					This is <a href="/">CSS Naked Day</a>. This page was generated by <a href="https://pages.github.com">GitHub Pages</a> (<a href="https://github.com/css-naked-day/css-naked-day.github.io">view it on GitHub</a>). Tactile theme by <a href="https://twitter.com/jasonlong">Jason Long</a>.
+					This is <a href="/">CSS Naked Day</a>. This page was generated by <a href="https://11ty.dev/">Eleventy</a> (<a href="https://github.com/css-naked-day/css-naked-day.github.io">view it on GitHub</a>). Tactile theme by <a href="https://twitter.com/jasonlong">Jason Long</a>.
 				</footer>
 			</div>
 		</div>