Mass fixes to headers in README.md files

There were many many README.md files with the wrong heading level for
different sections. These have been changed.

To help go through the changes it should be noted I used sgit and also
here is what is changed:

The 'Try', 'To build' and 'To run' lines have two '#'s. Some had one and
others had three.

An exception is that in 1984/anonymous/README.md for the alternative
code that had three '#'s. This is not consistent yet and it might be
that only two are desired. But for now that one at least has three.

2006/birken/README.md

@@ -6,13 +6,13 @@
     US
     o__1 at hotmail dot com
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./birken < file.tofu
@@ -22,7 +22,7 @@ make
 macOS with this entry. The problem was a missing `+1` for strlen() with
 malloc(). Thank you Cody for your assistance!
 
-### Try:
+## Try:
 
 ```sh
 ./birken < counter.tofu

2006/borsanyi/README.md

@@ -8,19 +8,19 @@
     United Kingdom
     s.borsanyi at sussex dot ac dot uk
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./borsanyi string > file.gif
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./borsanyi ioccc@example.com > example.gif

2006/grothe/README.md

@@ -5,19 +5,19 @@
     Omaha, NE 68106
     US
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./grothe carrier_freq pixelclock horizontal_total < some_input.txt
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./grothe 65000000 10000000 1344 < twinkle.txt

2006/hamre/README.md

@@ -3,19 +3,19 @@
     Steinar Hamre
     Norway
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./hamre math_expression_string
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./hamre '-1+4/3*(2+1/(3/2*(7/2-7/3+1/6)))/2'

2006/meyer/README.md

@@ -3,19 +3,19 @@
     Raphael Meyer
     US
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./meyer
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./meyer

2006/monge/README.md

@@ -7,7 +7,7 @@
     Italy
     maurizio.monge at gmail dot com
 
-# To build:
+## To build:
 
 
 Make sure you have the SDL1 (not SDL2!) development environment installed.
@@ -25,13 +25,13 @@ requires x86/x86_64 CPUs. Without it it might very well segfault (for instance
 it segfaulted on his MacBook Pro with the M1 chip).
 
 
-### To run:
+## To run:
 
 ```sh
 ./monge expression ...
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./monge "z = 0" "z = z*z*z + c; Abs2(z) < 4"

2006/night/README.md

@@ -7,19 +7,19 @@
     US
     <http://www.people.fas.harvard.edu/~night/>
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./night
 ```
 
-### Try:
+## Try:
 
 ```sh
 echo "Do or do not. There is no try."

2006/sloane/README.md

@@ -5,7 +5,7 @@
     Hartford, WI 53027
     US
 
-# To build:
+## To build:
 
 ```sh
 make

2006/stewart/README.md

@@ -3,19 +3,19 @@
     Thomas Stewart
     US
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./stewart
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./stewart 640 480 FILE

2006/sykes1/README.md

@@ -6,13 +6,13 @@
     Finland
     <http://www.stephensykes.com>
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./sykes1
@@ -20,7 +20,7 @@ make
 
 Next point your browser to the file: `sykes1.html`.
 
-### Try:
+## Try:
 
 ```sh
 ./sykes1 10

2006/sykes2/README.md

@@ -6,19 +6,19 @@
     Finland
     <http://www.stephensykes.com>
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./prog
 ```
 
-### Try:
+## Try:
 
 ```sh
 while :; do

2006/toledo1/README.md

@@ -6,19 +6,19 @@
     CP. 53110
     Mexico
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./toledo1 twodigits
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./toledo1 00

2006/toledo2/README.md

@@ -6,19 +6,19 @@
     CP. 53110
     Mexico
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./toledo2
 ```
 
-### Try:
+## Try:
 
 ```sh
 echo "Do or do not. There is no try."

2006/toledo3/README.md

@@ -6,19 +6,19 @@
     CP. 53110
     Mexico
 
-# To build:
+## To build:
 
 ```sh
 make
 ```
 
-### To run:
+## To run:
 
 ```sh
 ./toledo3 [1 | 2 | 3 [b]]
 ```
 
-### Try:
+## Try:
 
 ```sh
 ./toledo3 1