Revert esbuild from ^0.13.4 to 0.12.9

[thiskevinwang]

Reverts #194

esbuild@^0.13.4 causes an underlying lambda function (during Vercel ISR) to error.

Worth looking into evanw/esbuild@v0.12.9...v0.13.4

Error output

START RequestId: 7f15820d-e63e-4876-9a95-a5caff7f0a67 Version: $LATEST
2021-10-21T19:10:23.384Z	7f15820d-e63e-4876-9a95-a5caff7f0a67	WARN	Error: The package "esbuild-linux-64" could not be found, and is needed by esbuild.

If you are installing esbuild with npm, make sure that you don't specify the
"--no-optional" flag. The "optionalDependencies" package.json feature is used
by esbuild to install the correct binary executable for your current platform.
    at generateBinPath (/var/task/website/node_modules/esbuild/lib/main.js:1642:15)
    at esbuildCommandAndArgs (/var/task/website/node_modules/esbuild/lib/main.js:1698:11)
    at ensureServiceIsRunning (/var/task/website/node_modules/esbuild/lib/main.js:1855:25)
    at Object.transform (/var/task/website/node_modules/esbuild/lib/main.js:1750:37)
    at serialize (/var/task/website/node_modules/next-mdx-remote/dist/serialize.js:287:43)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async renderPageMdx (/var/task/website/.next/server/chunks/921.js:3166:21)
    at async generateStaticProps (/var/task/website/.next/server/chunks/921.js:3339:11)
    at async getStaticProps (/var/task/website/.next/server/pages/api-docs/[[...page]].js:62:19)
    at async Object.renderToHTML (/var/task/website/node_modules/next/dist/server/render.js:329:24)
END RequestId: 7f15820d-e63e-4876-9a95-a5caff7f0a67
REPORT RequestId: 7f15820d-e63e-4876-9a95-a5caff7f0a67	Duration: 1122.81 ms	Billed Duration: 1123 ms	Memory Size: 1024 MB	Max Memory Used: 175 MB

[thiskevinwang]

related: #197

[PabloSzx]

I feel like this issue should be posted in https://github.com/evanw/esbuild rather than here, since it's not an issue with next-mdx-remote

[jescalan]

Yeah, I'd love to get to the bottom of this rather than reverting if we are able to 🙏

[PabloSzx]

Another option is to have esbuild as peer dependency and leave up to the user to use esbuild 0.13 vs 0.12, or even allow an alias to another version, but that would be a new major for next-mdx-remote, and it also fixes the very common issue of having duplicated esbuilds

[thiskevinwang]

Good call @PabloSzx!

I'll see what I can reasonably grok from evanw/esbuild@v0.12.9...v0.13.4

Closing this for now!

[jescalan]

We spent some time looking into this and there isn't a straightforward fix to getting the latest esbuild working in serverless environments, so we are going to roll back for now to prevent continued errors.