Add docs link (#103)

* Added docs link to README

* Added docs to sidebar in-app

* Updated some tests

* Updated docs in media profile form

lib/pinchflat_web/components/layouts/partials/sidebar.html.heex

@@ -32,6 +32,12 @@
   <section>
     <nav class="px-4 py-4 lg:px-6">
       <ul class="mb-6 flex flex-col gap-1.5">
+        <.sidebar_item
+          icon="hero-book-open"
+          text="Docs"
+          target="_blank"
+          href="https://github.com/kieraneglin/pinchflat/wiki"
+        />
         <.sidebar_item
           icon="hero-code-bracket"
           text="Github"