Remove outdated documentation section from the "Setting Up Your Editor" page

This PR contains adjustments for the "Setting Up Your Editor" page

In the scope of this PR, I propose to remove the outdated documentation section pointing to not existing anymore Chrome extension by JetBrains

• Appropriate JetBrains ticket - https://youtrack.jetbrains.com/issue/WEB-49212
• Proof that the extension is removed from the Chrome store - https://chrome-stats.com/d/hmhgeddbohgjknpmjagkdomcpobmllji