[docs] Broken links on Getting project page

[bradbulger]

The two links in https://drupalconsole.com/docs/en/getting/project/ don't work:

• https://drupalconsole.com/docs/en/getting/project/launcher
• https://drupalconsole.com/docs/en/getting/project/composer

The submenu that appears in the left hand nav menu do work

• https://drupalconsole.com/docs/en/getting/composer
• https://drupalconsole.com/docs/en/getting/launcher

There's also a third link in the nav menu that doesn't appear in the page, "Installing on Windows"

• https://drupalconsole.com/docs/en/getting/windows

[bradbulger]

I also wonder if that Composer page is really up to date, I guess maybe that's a separate topic. I am using the current release of drupal from drupal/recommended-project, which installed 9.1.4. I tried just doing composer require drupal/console and it installed 1.9. It seems OK? I don't know enough to evaluate it.