enhance pandoc documentation generation

pass metadata and configuration with yaml file instead to put it into makefile and markdown file
This permit pretty mardown rendering into gitea GUI

Makefile

@@ -73,10 +73,5 @@ cleanD:
 	@rm -f data/*.key
 
 doc:
-	@pandoc -s -f markdown+emoji -t html \
-		--shift-heading-level-by=2 \
-		--wrap=preserve \
-		--toc \
-		--toc-depth=2 \
-		--highlight-style=tango \
-		-o readme.html readme.md
+	@pandoc --defaults=pandocConfig.yaml
+

pandocConfig.yaml

@@ -0,0 +1,38 @@
+from: markdown+emoji
+to: html5
+output-file: readme.html
+standalone: true
+self-contained: false
+
+# leave blank for input from stdin, use [] for no input:
+input-files:
+    - readme.md
+
+metadata:
+    title: "cryptomain.ex"
+    subtitle: "aes crypt / decrypt"
+    author: Antoine Roux <antoinroux@hotmail.fr>
+    date: 2020-04-27T02:17:42+02:00
+    abstract: "allow to crypt and decrypt file with aes algorithm"
+    description: |
+        this repository contain aes c++ program
+        this program allow to crypt and decrypt file
+    lang: en-GB
+
+# ERROR, WARNING, or INFO
+verbosity: INFO
+
+# auto, preserve, or none
+wrap: preserve
+columns: 78
+dpi: 72
+
+table-of-contents: true
+toc-depth: 2
+shift-heading-level-by: 2
+# lf, crlf, or native
+eol: lf
+ascii: true
+highlight-style: tango
+preserve-tabs: true
+fail-if-warnings: true

readme.md

@@ -1,16 +1,4 @@
----
-author: Antoine Roux <antoinroux@hotmail.fr>
-date: 2020-04-27T02:17:42+02:00
-title: "cryptomain.ex"
-subtitle: "aes crypt / decrypt"
-abstract: "allow to crypt and decrypt file with aes algorithm"
-description: |
-    this repository contain aes c++ program
-    this program allow to crypt and decrypt file
-lang: en-GB
----
-
-# this repository contains 3 mains :
+# this repository contains 3 Main :
 
 - crypto.ex use for test ( take a file, crypt and decrypt this file in one step )
 	products a crypted and decrypted file.