feat: create downloads/fringelands_mod page

src/routes/downloads/fringelands_mod/+page.svelte

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+<h1>Allam A's Fringelands Mod</h1>
+<p>The mod allows to scale noise on the X, Y and Z axes individually. There is also an offsetting feature which moves the map, along with other customization options.</p>
+<h2>Downloads for b1.7.3 (Mediafire links)</h2>
+<ul>
+    <li><a href="https://www.mediafire.com/file/r89fihej95a8ffx/FringeLands_b1_7_3.zip/file">v1</a></li>
+    <li><a href="https://www.mediafire.com/file/40bwlr5neb31guz/FringeLands_b1_7_3_v2.zip/file">v2</a></li>
+    <li><a href="https://www.mediafire.com/file/pwjja89mnfcrmnk/FringeLands_b1_7_3_v3.zip/file">v3</a></li>
+    <li><a href="https://www.mediafire.com/file/kqv7qzu6wvvemuw/FringeLands_b1_7_3_v4.zip/file">v4</a></li>
+    <li><a href="https://www.mediafire.com/file/mtjt7r7sw2q6div/FringeLands_b1_7_3_v5.zip/file">v5</a> (Note from Allam A: the Fartherer-est Lands option is disabled because when testing I realized that it would take much more work than I thought)</li>
+</ul>