Gallery vignette and a few palettes

• Implemented the following palettes: agender, alloace, aroallo, bigender, demiboy, demigirl.
• Simplified gay_man to gay (and, analogously, gay_7).
• Moved palettes to the "Gallery" vignette.

Full Changelog: v0.1.0...v0.1.1

Initial release v0.1.0

Initial release, 16 palettes available.

Full Changelog: https://github.com/turtletopia/gglgbtq/commits/v0.1.0