some updates to the project idea tutorial
some updates to the project idea tutorial

OpenAstronomy/openastronomy.github.io,OpenAstronomy/openastronomy.github.io,dpshelio/openastronomy.github.io,OpenAstronomy/openastronomy.github.io,Cadair/openastronomy.github.io,dpshelio/openastronomy.github.io,dpshelio/openastronomy.github.io,Cadair/openastronomy.github.io,Cadair/openastronomy.github.io