[docs] How to set up a source plugin fot gatsby-image (#8187)
[docs] How to set up a source plugin fot gatsby-image (#8187)

See #8185
The docs for gatsby-image should mention that a source plugin needs to be set up. This has come up in bugreports a couple of times recently.
0x80/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,mingaldrichgan/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby