Convert to README.md

Author: pmarinov

README.adoc renamed to README.md

@@ -1,84 +1,84 @@
-= README =
-:guides: http://tldp.org/guides.html
-:license: https://github.com/pmarinov/bash-scripting-guide/blob/master/LICENSE.txt
-:pollen: https://docs.racket-lang.org/pollen/index.html
+# README
+:license: 
+:pollen: 
 
 *Advanced Bash-Scripting Guide*
 (New Edition based on Pollen)
 
-Advanced Bash-Scripting Guide in HTML: +
+Advanced Bash-Scripting Guide in HTML:
 https://hangar118.sdf.org/p/bash-scripting-guide/
 
-Home page: +
-https://hangar118.sdf.org/p/bash-scripting-guide-home/
+Home page: https://hangar118.sdf.org/p/bash-scripting-guide-home/
 
-== About ==
+# About
 
-The _Advanced Bash-Scripting Guide_ is a book written by Mendel Cooper
-and part of The Linux Documentation Project, page
-{guides}[Guides]. *This is a fork* of the original work which itself
-had been (since 2014) dedicated to the *Public Domain*.
+The *Advanced Bash-Scripting Guide* is a book written by Mendel Cooper
+and part of The Linux Documentation Project (see
+[Guides](http://tldp.org/guides.html)). **This is a fork** of the
+original work which itself had been (since 2014) dedicated to the
+**Public Domain**.
 
 Motivation for the new edition:
 
 * To produce a modern-looking HTML format
 * To produce a GNU Info format, readable inside Emacs
-* To use Pollen as a publishing system, see {pollen}["Pollen: the book
-  is a program"]
+* To use Pollen as a publishing system, see ["Pollen: the book
+  is a program"](https://docs.racket-lang.org/pollen/index.html)
 * To invite contributions by hosting on GitHub
 
 == How to build ==
 
 Use `apt` to install `racket`:
 
-....
+```
 $ apt install racket
 
 $ racket --version
-....
+```
 
 Racket v7.0 is minimum
 
 Use `raco pkg` to install Pollen:
 
-....
+```
 $ raco pkg install pollen
-....
+```
 
 Installs in `~/.racket/7.2/pkgs`
 
 To read the documentation:
 
-....
+```
 $ raco docs pollen
-....
+```
 
 Also the book "Pollen: the book is a program" is at:
 `~/.racket/7.2/pkgs/pollen/pollen/doc/pollen/index.html`
 
 One more package:
 
-....
+```
 $ raco pkg install debug
-....
+```
 
 Install `makeinfo`
 
-....
+```
 $ apt install texinfo
-....
+```
 
 Now build the project via `make`:
 
-....
+```
 $ make all
-....
+```
 
 TODO: Describe output folders
 
 == License ==
 
-Public Domain, see {license}[LICENSE.txt]
+Public Domain, see
+[LICENSE.txt](https://github.com/pmarinov/bash-scripting-guide/blob/master/LICENSE.txt)
 
 == Changelog ==