Merging with dhamaniasad/awesome-linux

[inputsh]

There's been an agreement that this list will be combined with dhamaniasad/awesome-linux.

Progress:

• Combining the X Windows Managers section
• Making an edit to the CONTRIBUTING.md file stating the rules for including new X Windows Managers to the list.
• Creating a new subsection in the GUI-based applications for Graphical Package Managers, since they're not really DE-based but distro-based (suggestion for the name: Distro-based Package Management Tools)
• Figuring out where GParted should go
• Adding EDE to Other Desktop Environments
• Figuring out should Enlightenment be included in the DE section, WM section or possibly both sections (bug specific to this issue)

Cross-reference to the issue in that repository.

[dhamaniasad]

I've added the package management tools to the list. GParted could go under GUI-based Applications, maybe under a subsection called Partition Management Tools.