docs(perf): use swc-loader

[scarf005]

Summary

• migrate configuration file to typescript to get editor support
• use swc-loader, a drop-in webpack babel-loader replacement to improve build speed by ~16%.

Description

method	babel-loader (default)	swc-loader (new)
with minification	46.22s	38.59s (83% of original)
no minification	42.60s	34.73s (81% of original)

Log

$ yarn docusaurus clear
$ time yarn build --no-minify
   
[INFO] Use `npm run serve` command to test your build locally.
Done in 42.32s.

________________________________________________________
Executed in   42.60 secs    fish           external
   usr time   59.48 secs  861.00 micros   59.48 secs
   sys time    6.54 secs  143.00 micros    6.54 secs

$ yarn docusaurus clear
$ time yarn build
Done in 45.91s.

________________________________________________________
Executed in   46.22 secs    fish           external
   usr time   99.91 secs    0.00 micros   99.91 secs
   sys time    9.69 secs  965.00 micros    9.69 secs

$ yarn docusaurus clear
$ time yarn build --no-minify
Done in 34.43s.

________________________________________________________
Executed in   34.73 secs    fish           external
   usr time   50.03 secs    0.04 millis   50.03 secs
   sys time    4.80 secs    1.17 millis    4.79 secs

$ yarn docusaurus clear
$ time yarn build
Done in 38.30s.

________________________________________________________
Executed in   38.59 secs    fish           external
   usr time   89.68 secs    0.00 micros   89.68 secs
   sys time    7.01 secs  870.00 micros    7.01 secs

Additional context

guides followed:

• https://johnnyreilly.com/faster-docusaurus-build-swc-loader
• Performance - Reduce build time and memory usage facebook/docusaurus#4765 (comment)

[tgodzik]

Thanks!