A bunch of tiny little fixes for issues I found while setting up docusaurus (#312)

* Do not show users related UI if no users have been specified

* Fixed typo in Docusaurus homepage link

* Allow projects without icons

Not every project has an icon, so avoid showing a broken image in that case.

* Do not show project icon in the footer if there's no footer icon

docusaurus-init/README.md

@@ -1,6 +1,6 @@
 ## `docusaurus-init`
 
-An initialization script for [Docusaurus](https://docusuarus.io).
+An initialization script for [Docusaurus](https://docusaurus.io).
 
 ### What does it do?
 

examples/basics/core/Footer.js

@@ -14,12 +14,14 @@ class Footer extends React.Component {
       <footer className="nav-footer" id="footer">
         <section className="sitemap">
           <a href={this.props.config.baseUrl} className="nav-home">
+            {this.props.config.footerIcon && (
               <img
                 src={this.props.config.baseUrl + this.props.config.footerIcon}
                 alt={this.props.config.title}
                 width="66"
                 height="58"
               />
+            )}
           </a>
           <div>
             <h5>Docs</h5>

examples/basics/pages/en/index.js

@@ -167,6 +167,9 @@ const Description = props => (
 );
 
 const Showcase = props => {
+  if ((siteConfig.users||[]).length === 0) {
+    return null;
+  }
   const showcase = siteConfig.users
     .filter(user => {
       return user.pinned;

lib/core/nav/HeaderNav.js

@@ -188,10 +188,12 @@ class HeaderNav extends React.Component {
         <div className="headerWrapper wrapper">
           <header>
             <a href={this.props.baseUrl}>
+              {siteConfig.headerIcon && (
                 <img
                   className="logo"
                   src={this.props.baseUrl + siteConfig.headerIcon}
                 />
+              )}
               {!this.props.config.disableHeaderTitle && (
                 <h2 className="headerTitle">{this.props.title}</h2>
               )}