Add Jekyll SEO plugin

- Add all the Apple touch and Microsoft icons
- Fix Jekyll config error
- Add a `browserconfig.xml` file
- Add `alt`, `title`, `width` and `height` attributes to images
- Add `lang="en"` to the start `html` tag
- Add `meta viewport` tag
- Created `robots.txt`
- Created `maskable icon`
- Created `Safari pinned tab icon`
- Add all the Android icon sizes
- Set `favicon.ico` to 48px square
- Strip blank line from HTML
- refs #85
- refs #89

https://webhint.io/docs/user-guide/hints/hint-apple-touch-icons/
https://github.com/jekyll/jekyll-seo-tag

Author: jbampton

Gemfile

@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'github-pages'
+gem 'jekyll-seo-tag'
 
 group :scripts do 
   gem 'mgem' 

Gemfile.lock

@@ -266,6 +266,7 @@ PLATFORMS
 DEPENDENCIES
   git
   github-pages
+  jekyll-seo-tag
   mgem
   yard-coderay
   yard-mruby

_config.yml

@@ -10,7 +10,13 @@ markdown: kramdown
 highlighter: rouge
 url: https://mruby.org
 repository: https://github.com/mruby/mruby.github.io
-include: _index.html
+include: ['_index.html']
+image:
+  path: /images/mruby_logo_red_icon.png
+  height: 300
+  width: 300
+plugins:
+  - jekyll-seo-tag
 exclude:
 - Gemfile
 - Gemfile.lock

_includes/header.html

@@ -1,9 +1,7 @@
         <meta charset="utf-8">
-
+        <meta name="viewport" content="width=device-width,initial-scale=1">
         <title>{{ page.title }}</title>
 
-        {% include icons.html %}
-
         <!-- Bootstrap CSS -->
         <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
 
@@ -16,3 +14,6 @@
 
         <!-- Custom CSS -->
         <link rel="stylesheet" href="/css/main.css">
+
+        {% include icons.html %}
+        {% seo title=false %}

_includes/icons.html

@@ -1,8 +1,20 @@
+<!-- Favicon -->
+<link rel="apple-touch-icon" sizes="57x57" href="/images/icons/apple-touch-icon-57x57.png?v=1">
+<link rel="apple-touch-icon" sizes="60x60" href="/images/icons/apple-touch-icon-60x60.png?v=1">
+<link rel="apple-touch-icon" sizes="72x72" href="/images/icons/apple-touch-icon-72x72.png?v=1">
+<link rel="apple-touch-icon" sizes="76x76" href="/images/icons/apple-touch-icon-76x76.png?v=1">
+<link rel="apple-touch-icon" sizes="114x114" href="/images/icons/apple-touch-icon-114x114.png?v=1">
+<link rel="apple-touch-icon" sizes="120x120" href="/images/icons/apple-touch-icon-120x120.png?v=1">
+<link rel="apple-touch-icon" sizes="144x144" href="/images/icons/apple-touch-icon-144x144.png?v=1">
+<link rel="apple-touch-icon" sizes="152x152" href="/images/icons/apple-touch-icon-152x152.png?v=1">
+<link rel="apple-touch-icon" sizes="180x180" href="/images/icons/apple-touch-icon-180x180.png?v=1">
+<link rel="icon" type="image/png" sizes="32x32" href="/images/icons/favicon-32x32.png?v=1">
+<link rel="icon" type="image/png" sizes="192x192" href="/images/icons/android-chrome-192x192.png?v=1">
+<link rel="icon" type="image/png" sizes="16x16" href="/images/icons/favicon-16x16.png?v=1">
+<link rel="manifest" href="/images/icons/site.webmanifest?v=1">
+<link rel="mask-icon" href="/images/icons/safari-pinned-tab.svg?v=1" color="#e0115f">
+<link rel="shortcut icon" href="/favicon.ico?v=1">
+<meta name="msapplication-TileColor" content="#da532c">
+<meta name="msapplication-TileImage" content="/images/icons/mstile-144x144.png?v=1">
+<meta name="msapplication-config" content="/images/icons/browserconfig.xml?v=1">
 <meta name="theme-color" content="#e0115f">
-
-        <!-- Favicon -->
-        <link rel="icon" type="image/x-icon" href="/favicon.ico">
-        <link rel="apple-touch-icon" sizes="180x180" href="/images/icons/apple-touch-icon.png">
-        <link rel="icon" type="image/png" sizes="32x32" href="/images/icons/favicon-32x32.png">
-        <link rel="icon" type="image/png" sizes="16x16" href="/images/icons/favicon-16x16.png">
-        <link rel="manifest" href="/images/icons/site.webmanifest">

_includes/navigation.html

@@ -1,6 +1,8 @@
             <nav class="navbar navbar-mruby" role="navigation">
               <div class="navbar-header">
-                <a href="/"><img src="/images/mruby_header.png" alt="mruby" title="mruby"></a>
+                <a href="/">
+                  <img src="/images/mruby_header.png" alt="mruby" title="mruby" width="214" height="90">
+                </a>
               </div>
 
               <div>
@@ -30,5 +32,4 @@
                 </form>
                 -->
               </div>
-
             </nav>

_layouts/default.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     {% include header.html %}
   </head>

_layouts/post.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     {% include header.html %}
   </head>

browserconfig.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig><msapplication><tile><square70x70logo src="/images/icons/ms-icon-70x70.png"/><square150x150logo src="/images/icons/ms-icon-150x150.png"/><square310x310logo src="/images/icons/ms-icon-310x310.png"/><TileColor>#e0115f</TileColor></tile></msapplication></browserconfig>