Fixes and improvements in 1980s index.html files

A point of interest is that in 1987 the README.md referred to Mark R
Horton but it is now Mary Ann Horton so I changed it to that. Also as
she has won I linked to not the Amazon author page but rather the
authors.html link. It's important to note though that the author page on
Amazon says Mark still, perhaps because that is how the book was
published (I guess - I didn't look). Still it seems right to change it
to how she identifies, rather than not.

Links were added for entries where referred to. Links were added to
results where not linked to. It is unclear if links to USENET groups
should be kept (besides the ones where the direct posts are known) or
removed so I have not added any that have missing links even those that
were already in other README.md files.

What remains to be done for the 1980s README.md files depends on whether
the USENET group links that are there should be removed or if those
missing should be added.

The rendered html files were tested on my web server and all appears
okay.

1989/README.md

@@ -8,7 +8,7 @@ You may then wish to look at the Author's remarks for even more details.
 Instructions for use: Run `make` to compile entries (it is possible that on
 System V or non-Unix systems the Makefile needs to be changed).
 
-This year, the Grand Prize was given to the most useful program.
+This year, the [Best of Show](jar.2/index.html) was given to the most useful program.
 
 The ["Strangest abuse of the rules"](jar.1/indx.html) award was given this year
 to stress the fact that starting in 1990, compiling entries must result a
@@ -20,7 +20,7 @@ using it.  In the case of the ["Best game"](tromp/README) entry, however, some
 functionality is lost in the portable version and so the Makefile uses
 the original program.
 
-[Rules](rules.txt) and results were posted to comp.lang.c, comp.sources.unix, and
+[Rules](rules.txt) and [results](../years.html#1989) were posted to comp.lang.c, comp.sources.unix, and
 alt.sources.  They have been made available on a wide number of USENET
 archive sites such as uunet.  The 1989 winning entries will be published in the
 [Micro/Systems

1989/index.html

@@ -132,7 +132,7 @@ Look at the winning source and try to figure how it does what it does!
 You may then wish to look at the Author’s remarks for even more details.</p>
 <p>Instructions for use: Run <code>make</code> to compile entries (it is possible that on
 System V or non-Unix systems the Makefile needs to be changed).</p>
-<p>This year, the Grand Prize was given to the most useful program.</p>
+<p>This year, the <a href="jar.2/index.html">Best of Show</a> was given to the most useful program.</p>
 <p>The <a href="jar.1/indx.html">“Strangest abuse of the rules”</a> award was given this year
 to stress the fact that starting in 1990, compiling entries must result a
 regular executable file.</p>
@@ -141,7 +141,7 @@ self modifying program”</a> because there is no loss of functionality in
 using it. In the case of the <a href="tromp/README">“Best game”</a> entry, however, some
 functionality is lost in the portable version and so the Makefile uses
 the original program.</p>
-<p><a href="rules.txt">Rules</a> and results were posted to comp.lang.c, comp.sources.unix, and
+<p><a href="rules.txt">Rules</a> and <a href="../years.html#1989">results</a> were posted to comp.lang.c, comp.sources.unix, and
 alt.sources. They have been made available on a wide number of USENET
 archive sites such as uunet. The 1989 winning entries will be published in the
 <a href="https://www.vintage-computer.com/publications.php?microsystemsjournal">Micro/Systems