Fix stray partial link in 2019/dogon/README.md

This was at the top of the file on the same line as '## To build:' and
it caused strange output in the index.html file (and was incorrect in
any case).

2019/dogon/README.md

@@ -1,4 +1,4 @@
-%%REPO_URL%%/2019/lynn/## To build:
+## To build:
 
 ``` <!---sh-->
     make

2019/dogon/index.html

@@ -401,7 +401,7 @@ Location: <a href="../../location.html#IL">IL</a> - <em>State of Israel</em> (<e
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
 <!-- BEFORE: 1st line of markdown file: 2019/dogon/README.md -->
-<p>https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/lynn/## To build:</p>
+<h2 id="to-build">To build:</h2>
 <pre><code>    make</code></pre>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
 <p>The current status of this entry is:</p>