Clarify project structure

www/about/index.php

@@ -1,10 +1,10 @@
 <?
 require_once('Core.php');
-?><?= Template::Header(['title' => 'About Standard Ebooks', 'highlight' => 'about', 'description' => 'The Standard Ebooks project is a volunteer driven, not-for-profit effort to produce a collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks that meet or exceed the quality of commercially produced ebooks. The text and cover art in our ebooks is already believed to be in the public domain, and Standard Ebook dedicates its own work to the public domain, thus releasing the entirety of each ebook file into the public domain.']) ?>
+?><?= Template::Header(['title' => 'About Standard Ebooks', 'highlight' => 'about', 'description' => 'The Standard Ebooks project is a volunteer-driven effort to produce a collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks that meet or exceed the quality of commercially produced ebooks. The text and cover art in our ebooks is already believed to be in the public domain, and Standard Ebook dedicates its own work to the public domain, thus releasing the entirety of each ebook file into the public domain.']) ?>
 <main>
 	<article>
 		<h1>About Standard Ebooks</h1>
-		<p>The Standard Ebooks project is a volunteer driven, not-for-profit effort to produce a collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks that meet or exceed the quality of commercially produced ebooks. The text and cover art in our ebooks is already believed to be in the public domain, and Standard Ebooks dedicates its own work to the public domain, thus releasing the entirety of each ebook file into the public domain. All the ebooks we produce are distributed free of cost and free of U.S. copyright restrictions.</p>
+		<p>The Standard Ebooks project is a volunteer-driven effort to produce a collection of high quality, carefully formatted, accessible, open source, and free public domain ebooks that meet or exceed the quality of commercially produced ebooks. The text and cover art in our ebooks is already believed to be in the public domain, and Standard Ebooks dedicates its own work to the public domain, thus releasing the entirety of each ebook file into the public domain. All the ebooks we produce are distributed free of cost and free of U.S. copyright restrictions.</p>
 		<section id="more-information">
 			<h2>More information</h2>
 			<ul>

www/contribute/index.php

@@ -6,7 +6,7 @@ require_once('Core.php');
 		<h1>Get Involved</h1>
 		<section id="intro">
 			<h2>Help create ebooks that are a pleasure to read</h2>
-			<p>Standard Ebooks is a volunteer driven project, and there’s room for people of all skill levels to contribute.</p>
+			<p>Standard Ebooks is a volunteer-driven project, and there’s room for people of all skill levels to contribute.</p>
 			<p>At the most basic level, anyone can <a href="https://groups.google.com/g/standardebooks">contribute feedback via our mailing list</a>. Day-to-day readers can <a href="/contribute/report-errors">tell us about errors they spot in our ebooks</a>. People with an eye for typography and a talent for editing can proofread whole ebooks. Technically inclined readers can produce ebooks themselves, or <a href="https://github.com/standardebooks">contribute via GitHub</a>. You can also <a href="/donate">make a financial contribution</a> to help fund continued ebook development.</p>
 		</section>
 		<section id="everyone">

www/index.php

@@ -7,7 +7,7 @@ require_once('Core.php');
 		<source srcset="/images/devices@2x.png 2x, /images/devices.png 1x" type="image/png"/>
 		<img src="/images/devices@2x.png" alt="Ereaders with a Standard Ebook open."/>
 	</picture>
-	<p>Standard Ebooks is a volunteer driven, not-for-profit project that produces new editions of public domain ebooks that are lovingly formatted, open source, and free.</p>
+	<p>Standard Ebooks is a volunteer-driven project that produces new editions of public domain ebooks that are lovingly formatted, open source, free of copyright restrictions, and free of cost.</p>
 	<p>Ebook projects like <a href="https://www.gutenberg.org">Project Gutenberg</a> transcribe ebooks and make them available for the widest number of reading devices. Standard Ebooks takes ebooks from sources like Project Gutenberg, formats and typesets them using a carefully designed and professional-grade style manual, fully proofreads and corrects them, and then builds them to create a new edition that takes advantage of state-of-the-art ereader and browser technology.</p>
 	<p>Standard Ebooks aren’t just a beautiful addition to your digital library—they’re a high quality standard to build your own ebooks on.</p><a class="button next" href="/ebooks">Browse our library of free ebooks</a>
 	<section>