Add POSIX buzzword to homepage and about page.

src/about/index.html

@@ -43,6 +43,8 @@ __HEADER__
                         <p>Adélie is an independent Libre operating system based on the Linux kernel and musl runtime library.<br />We focus on reliability, security, compatibility, portability, and usability.</p>
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                         <p>Simplicity is a feature, not a bug&mdash;icebergs are best observed from a distance.<br />That's why Adélie is built on top of proven standards and technologies. It's core to everything we do.</p>
+                        <br />
+                        <p>We're architecting Adélie in pursuit of <a href="http://get.posixcertified.ieee.org/certification_guide.html#Introduction"><strong>POSIX<sup>&reg;</sup> Certification</a></strong>.</p>
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src/index.html

@@ -84,7 +84,7 @@ __HEADER__
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                         <h6 class="font-weight-medium font-small uppercase">Reliable</h6>
-                        <p>We work side-by-side with kernel engineers, the musl libc project, and adjacent communities to create an environment that conforms to global operating system standards.</p>
+                        <p>We work side-by-side with kernel engineers, the musl libc project, and adjacent communities to create an environment that conforms to global operating system standards such as POSIX<sup>&reg;</sup>.</p>
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