chore: allow windows developers to work with this repo without hassle

[bwajtr]

Description

• The default value of endOfLine check in Prettier changed from auto to LF in version 2.0.0. This is very inconvenient for Windows developers. Because when you install git on Winwows, you'll automatically have core.autocrlf set to true, which will basically change all LF line endings to CRLF line endings when you clone the repository. Git then ensures that CRLF is converted back to LF on commit. However, because you have CRLF locally, Prettier checks fail. The solution to this is to not enforce line endings by Prettier, but actually, let git handle it automatically.
  • I've set Prettier 'endOfLine' to auto again, so Prettier ignores it
  • Introduced .gitattributes file, which enables git to handle CRLF to LF conversion for Windows developers automatically, regadless of their local settings of core.autocrlf. Git makes sure, thanks to this file, that remote will always contain only LF. Topic is explained here.
• Introduced very basic .editorconfig - basically to remove the need to manually set the line length to 120 in editors which respect .editorconfig (for example Intellij Idea does and .editorconfig by default overrides any settings made by the developer)
• Additionally fix of some *.js scripts so they are runnable also on Windows machines
• Also added .idea directory to .gitingore so IntelliJ Idea project files are ignored when you work with the repository in Idea

Type of change

[x] Chore

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[vaadin-bot]

Hi @bwajtr , this commit cannot be picked to 24.0 by this bot, can you take a look and pick it manually?
Error Message: Error: Command failed: git cherry-pick b705fbd
error: could not apply b705fbd... chore: allow windows developers to work with this repo without hassle (#5686)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.1.0.alpha2 and is also targeting the upcoming stable 24.1.0 version.