Remove IPNS support and related content

Deleted IPNS view, content, and asset files. Removed references to IPNS from the README, sidebar, and documentation pages. This feature is no longer supported for hosting.

assets/svg/ipns-icon.svg

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg width="100%" height="100%" viewBox="0 0 24 24" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" fill-rule="evenodd" clip-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="2">
-    <path d="M21,7.702L12.5,12.322L12.5,22C14.067,21.135 18.879,18.483 20.477,17.601C20.8,17.424 21,17.082 21,16.71L21,7.702ZM11.5,12.321L3,7.599L3,16.605C3,16.975 3.197,17.313 3.514,17.492C5.104,18.39 9.93,21.115 11.5,22L11.5,12.321ZM3.421,6.692L12,11.455L20.672,6.742C20.672,6.742 14.041,3.004 12.486,2.128C12.335,2.043 12.167,2 12,2C11.832,2 11.665,2.043 11.514,2.128C9.959,3.004 3.421,6.692 3.421,6.692Z" fill="#5C6F8A" fill-rule="nonzero"/>
-</svg>