Add vscode the essentials book, improve associated section

[Mamadou442]

What does this PR do?

Add resource(s), improve IDE and text editors (EN) section

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For resources

Description

• New Book : Visual Studio Code - The Essentials

  • "This book is currently a public preview. We are actively working on improving the content and adding more chapters." -- associated github page

  • so it's a "in-progress" book.
• fix dead link for "A Byte of Vim", adding missing authors, author full name
• 'Visual Studio 2019 Succinctly' : 'HTML' > 'online' for listing formats
• citing license and formats for various vim books (see commits title)
• book title: "The Craft of Text Editing or A Cookbook for an Emacs" < "The Craft of Text Editing or Emacs for the Modern World"
  • the website front page title got updated but not the downloadable formats (e.g PDF), as far as i know.
• Learn Vim (the Smart Way): removing the "in-process" notation, not mentioned in the linking page.

How do we know it's really free?

for "Visual Studio Code - The Essentials": see the notice page

Checklist:

• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-subjects.md
379:3-379:46  warning  Remove trailing slash (https://vim.swaroopch.com)  no-url-trailing-slash  remark-lint

[eshellman]

dont forget to remove draft label when done

[Mamadou442]

thank you for reminding me. Does the "Visual Studio .NET Tips and Tricks" and "Visual Studio 2019 Succinctly" books should be remove ? They require a registration.