Fetch all resources from a single CDN (#893)

And add a mathjax testing vignette

NEWS.md

@@ -1,5 +1,8 @@
 # pkgdown 1.1.0.9000
 
+* All third party resources are now fetched from a single CDN and are associated
+  with a SRI hash (@bisaloo, #893).
+
 * Stricter regular expression when added links to GitHub authors in `NEWS.md`
   (#902)
 

inst/templates/docsearch.html

@@ -1,5 +1,5 @@
 {{#yaml}}{{#docsearch}}
-<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/docsearch.js/2.6.1/docsearch.min.js" integrity="sha256-GKvGqXDznoRYHCwKXGnuchvKSwmx9SRMrZOTh2g4Sb0=" crossorigin="anonymous"></script>
 <script>
   docsearch({
     {{#app_id}}appId: '{{.}}',{{/app_id}}

inst/templates/head.html

@@ -18,17 +18,17 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
 <!-- Bootstrap -->
 {{#yaml}}
-{{#bootswatch}}<link href="https://maxcdn.bootstrapcdn.com/bootswatch/3.3.7/{{.}}/bootstrap.min.css" rel="stylesheet" crossorigin="anonymous">{{/bootswatch}}
-{{^bootswatch}}<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">{{/bootswatch}}
+{{#bootswatch}}<link href="https://cdnjs.cloudflare.com/ajax/libs/bootswatch/3.3.7/{{.}}/bootstrap.min.css" rel="stylesheet" crossorigin="anonymous" />{{/bootswatch}}
+{{^bootswatch}}<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha256-916EbMg70RQy9LHiGkXzG8hSg9EdNy97GazNG/aiY1w=" crossorigin="anonymous" />{{/bootswatch}}
 {{/yaml}}
 
-<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha256-U5ZEeKfGNOja007MMD3YBI0A3OSZOQbeG6z2f2Y0hu8=" crossorigin="anonymous"></script>
 
 <!-- Font Awesome icons -->
-<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-T8Gy5hrqNKT+hzMclPo118YTQO6cYprQmhrYwIiQ/3axmI1hQomh7Ud2hPOy8SP1" crossorigin="anonymous">
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" integrity="sha256-eZrrJcwDc/3uDhsdt61sL2oOBY362qM3lon1gyExkL0=" crossorigin="anonymous" />
 
 <!-- clipboard.js -->
-<script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.1/clipboard.min.js" integrity="sha256-hIvIxeqhGZF+VVeM55k0mJvWpQ6gTkWk3Emc+NmowYA=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js" integrity="sha256-FiZwavyI2V6+EXO1U+xzLG3IKldpiTFf3153ea9zikQ=" crossorigin="anonymous"></script>
 
 <!-- sticky kit -->
 <script src="https://cdnjs.cloudflare.com/ajax/libs/sticky-kit/1.1.3/sticky-kit.min.js" integrity="sha256-c4Rlo1ZozqTPE2RLuvbusY3+SU1pQaJC0TjuhygMipw=" crossorigin="anonymous"></script>
@@ -40,8 +40,7 @@
 {{#yaml}}{{#docsearch}}
 <!-- docsearch -->
 <script src="{{#site}}{{root}}{{/site}}docsearch.js"></script>
-<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" />
-<link href="{{#site}}{{root}}{{/site}}docsearch.css" rel="stylesheet">
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/docsearch.js/2.6.1/docsearch.min.css" integrity="sha256-QOSRU/ra9ActyXkIBbiIB144aDBdtvXBcNc3OTNuX/Q=" crossorigin="anonymous" />
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mark.js/8.11.1/jquery.mark.min.js" integrity="sha256-4HLtjeVgH0eIB3aZ9mLYF6E8oU5chNdjU6p6rrXpl9U=" crossorigin="anonymous"></script>
 {{/docsearch}}{{/yaml}}
 
@@ -65,7 +64,8 @@
 {{#development}}{{#in_dev}}<meta name="robots" content="noindex">{{/in_dev}}{{/development}}
 
 <!-- mathjax -->
-<script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS-MML_HTMLorMML'></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/RWIsaSScxxlsrv8k=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-84DKXVJXs0/F8OTMzX4UR909+jtl4G7SPypPavF+GfA=" crossorigin="anonymous"></script>
 
 <!--[if lt IE 9]>
 <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>

vignettes/test/mathjax.Rmd

@@ -0,0 +1,7 @@
+---
+title: "Test: Mathjax"
+---
+
+$$f(x) = \dfrac{1}{\sqrt{2\pi\sigma^2}} e^{-\frac{(x-\mu^2)}{2\sigma^2}}$$
+
+Inline equations: $y=x^2$