fix: add custom provider explanation#241

kstroobants wants to merge 2 commits intomaingenlayerlabs/genlayer-docs:mainfrom

dxp-400-document-how-to-add-a-new-inference-provider-to-the-studiogenlayerlabs/genlayer-docs:dxp-400-document-how-to-add-a-new-inference-provider-to-the-studioCopy head branch name to clipboard