Update Gammapy project descriptions based on feedback by @eteq
Update Gammapy project descriptions based on feedback by @eteq
OpenAstronomy/openastronomy.github.io,Cadair/openastronomy.github.io,dpshelio/openastronomy.github.io,OpenAstronomy/openastronomy.github.io,dpshelio/openastronomy.github.io,tammojan/openastronomy.github.io,Cadair/openastronomy.github.io,tammojan/openastronomy.github.io,tammojan/openastronomy.github.io,Cadair/openastronomy.github.io,dpshelio/openastronomy.github.io,OpenAstronomy/openastronomy.github.io