download.html: only use SHA256 sum

MD5 and to a lesser degree SHA1 are no longer useful to detect malicious modfication, so don't mention them.
Clarify that the numbers after the exe are hashsums.
Closes #10066

download.html

@@ -20,15 +20,11 @@
 
 <h2><a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl">2016.07.11</a> (<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl.sig">sig</a>)</h2>
 
-<ul>
-<li><strong>MD5</strong>: d76d7817af3fa4a0f42406df13f041c0</li>
-<li><strong>SHA1</strong>: 11fad82b2911f1d6cf7362e473e570d750932e91</li>
-<li><strong>SHA256</strong>: 69a01054ef78f9b738ac2beef4d1ae92ec89edcc42c08aee9836c2f558e00308</li>
-</ul>
+<div><strong>SHA256</strong>: 69a01054ef78f9b738ac2beef4d1ae92ec89edcc42c08aee9836c2f558e00308</div>
 
 <p>
-	<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl.exe">Windows exe</a> (<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl.exe.sig">sig</a> - 4fab215c8ee60e7241097867d82bfde80a58d0c7ce3446d06b15a82826e172c6)<br>
-	<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl-2016.07.11.tar.gz">Full source + docs + binary tarball</a> (<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl-2016.07.11.tar.gz.sig">sig</a> - f661957cf1f52bfa7b621cf1b02c0200862a7931e92e25cd984a9c302c3e4d87)
+	<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl.exe">Windows exe</a> (<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl.exe.sig">sig</a> - SHA256 4fab215c8ee60e7241097867d82bfde80a58d0c7ce3446d06b15a82826e172c6)<br>
+	<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl-2016.07.11.tar.gz">Full source + docs + binary tarball</a> (<a href="https://yt-dl.org/downloads/2016.07.11/youtube-dl-2016.07.11.tar.gz.sig">sig</a> - SHA256 f661957cf1f52bfa7b621cf1b02c0200862a7931e92e25cd984a9c302c3e4d87)
 </p>
 
 <p>To install it right away for all UNIX users (Linux, OS X, etc.), type:

download.html.in

@@ -20,15 +20,11 @@
 
 <h2><a href="@PROGRAM_URL@">@PROGRAM_VERSION@</a> (<a href="@PROGRAM_URL@.sig">sig</a>)</h2>
 
-<ul>
-<li><strong>MD5</strong>: @PROGRAM_MD5SUM@</li>
-<li><strong>SHA1</strong>: @PROGRAM_SHA1SUM@</li>
-<li><strong>SHA256</strong>: @PROGRAM_SHA256SUM@</li>
-</ul>
+<div><strong>SHA256</strong>: @PROGRAM_SHA256SUM@</div>
 
 <p>
-	<a href="@EXE_URL@">Windows exe</a> (<a href="@EXE_URL@.sig">sig</a> - @EXE_SHA256SUM@)<br>
-	<a href="@TAR_URL@">Full source + docs + binary tarball</a> (<a href="@TAR_URL@.sig">sig</a> - @TAR_SHA256SUM@)
+	<a href="@EXE_URL@">Windows exe</a> (<a href="@EXE_URL@.sig">sig</a> - SHA256 @EXE_SHA256SUM@)<br>
+	<a href="@TAR_URL@">Full source + docs + binary tarball</a> (<a href="@TAR_URL@.sig">sig</a> - SHA256 @TAR_SHA256SUM@)
 </p>
 
 <p>To install it right away for all UNIX users (Linux, OS X, etc.), type: