markdown: enable autowriteall for markdown files

- Enables `autowriteall` for markdown files (pandoc filteype, as I use
  the vim-pandoc plugin).
- Modify the rules to ignore spell files.

Co-Authored-by: iGor milhit <igor@milhit.ch>

.gitignore

@@ -6,6 +6,7 @@ autoload
 .netrwhist
 
 # spell
+*.spl
 spell/*
 
 tags

.gitignore.orig

@@ -0,0 +1,20 @@
+# `vim-plug` plugins
+plugged/*
+autoload
+
+# netrw
+.netrwhist
+
+<<<<<<< HEAD
+# spell *.spl
+=======
+# spell
+*.spl
+>>>>>>> c47fcd7 (gitignore: try to improve the spell rule)
+spell/*
+
+tags
+test.sh
+.luarc.json
+nvim
+lazy-lock.json

after/ftplugin/pandoc.lua

@@ -3,4 +3,3 @@
 --  See :h awa
 
 vim.opt.awa=true
-vim.opt.colorcolumn=""

spell/en.utf-8.add

@@ -0,0 +1,13 @@
+AoU
+Floriane
+Séverine
+HEG
+neovim
+lua
+InfoBiblio
+Réaménagement
+biodiversité
+hyperindustrialisés
+lacto-fermentation
+d'engrain
+écorcheuse