fix many internal links

Fixed a number of internal links that need to
go to the GitHub site.

Ran `make www` to perform the above.

1996/august/README.md

@@ -104,7 +104,7 @@ of operators, and control constructs.
 The compiler has absolutely no error checking, so things
 can go wrong.  But this is what seasoned C programmers are used to.
 
-Assume that the interpreter has been compiled (source in [august.c](august.c)
+Assume that the interpreter has been compiled (source in [august.c](%%REPO_URL%%/1996/august/august.c)
 and binary in august) and that we have this in a file named `test.oc`:
 
 ``` <!---c-->

1996/august/index.html

@@ -429,7 +429,7 @@ syntax). Arrays can only be global. There is a rather limited set
 of operators, and control constructs.</p>
 <p>The compiler has absolutely no error checking, so things
 can go wrong. But this is what seasoned C programmers are used to.</p>
-<p>Assume that the interpreter has been compiled (source in <a href="august.c">august.c</a>
+<p>Assume that the interpreter has been compiled (source in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1996/august/august.c">august.c</a>
 and binary in august) and that we have this in a file named <code>test.oc</code>:</p>
 <pre><code>    main() { putchar(&#39;!&#39;); putchar(&#39;\n&#39;); exit(0); }</code></pre>
 <p>We can then compile by</p>