* 'A Byte of Vim': dead link, missing authors
* 'Visual Studio 2019 Succinctly': 'HTML' > 'online'
* Adding 'Visual Studio Code - The Essentials', its authors, format, licence, wip notation
* removing trailing slash
* licence for A Byte of Vim, GNU Emacs Manual, Learn Vim (the Smart Way)
* adding formats for learn Neovim, learn Vim For the Last Time, learn Vim Progressively and learn Vimscript the Hard Way
* adding licence for vim galore
* format and licence for Vim Reference Guide
* updating 'The Craft of Text Editing' full title
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