Add a website overview, GNU/Linux support, and emojis

[michaelsilver]

In the process:

• Updated all packages
• Added jemoji as a plugin
• Added gnu-linux as a separate category for support in posts going forward
• Wrote a more friendly introduction on the homepage with the help of @nambrath

Close #13

[cmnord]

Looks awesome :D I love the emojis :heart_eyes: