Update docs for existing Next.js websites on Netlify to include basic build settings

[DaveBitter]

Is your feature request related to a problem? Please describe.
I had an existing site on Netlify that didn't use this awesome plugin yet where I just used Next.js static site generation (SSG). For that, you usually configure two deploy settings in Netlify:

• Build command: npm run build && npm run export
• Publish directory: out

What I didn't realize is that I needed to change the build command to just npm run build and leave the publish directory blank. It might be an obvious thing for people, but I couldn't find this documented anywhere.

Describe the solution you'd like
I think it would be great to document these two deploy settings in the README under Installation and Configuration -> UI-based installation for existing Next.js sites. I'm more than happy to pick this up.

Describe alternatives you've considered
An alternative is to close this issue and have it as a reference. I tried searching the issues for this and couldn't find it.

Additional context
n/A

Thanks for this awesome plugin!

[lindsaylevine]

@DaveBitter would love for you to open a PR with what you'd like to see!!!

[Nicoowr]

That'd be great!
On a side note, what you suggested did not work for me, I had to use a custom netlify.toml file, with this config to make it work:

[build]
command = "next build"
publish = ".next"

[[plugins]]
package = "@netlify/plugin-nextjs"

I also had to specify target: "serverless" in next.config.js

[lindsaylevine]

@Nicoowr

[build]
command = "npm run build"
publish = "out"

[[plugins]]
package = "@netlify/plugin-nextjs"

works for thousands of sites!

if you wanna send over a repo demonstrating that it doesnt work for you, id be happy to dig into it!

[lindsaylevine]

@DaveBitter hey dave are you wanting to open a PR for this? otherwise i can take care of it!

[Nicoowr]

@lindsaylevine yes it seems that the problem comes from our own website settings. I'll dig into it :)
Anyway, the mentioned config in the docs works for new apps from scratch!

[DaveBitter]

I'm so sorry for responding this late! I see that you already merged a change to the docs. Perfect 👌