docs: make contributing.md more contributor-friendly

[ctjlewis]

I originally sought out to add a statement about chromedriver before investing time in making the document as clear as possible for new contributors on the first read. Any notes are very welcome.

• add Ubuntu/Debian apt install chromedriver tip
• consistent heading names, subheadings
• formatting
• order changes:
  1. Developing
  2. Building
  3. Testing
  4. Adding warning/error descriptions
  5. Adding examples

Documentation / Examples

• Make sure the linting passes

[ctjlewis]

Not sure why lint is failing, but contributing.md is the only file changed here and is passing, so can probably be safely ignored.

[leerob]

This is great, thank you so much!

[ijjk]

Failing test suites

Commit: f8fa614

test/acceptance/ReactRefreshLogBox.dev.test.js

• server-side only compilation errors

Expand output

● server-side only compilation errors

ScriptTimeoutError: script timeout
  (Session info: headless chrome=92.0.4515.131)

  72 |
  73 |             // Wait for application to re-hydrate:
> 74 |             await browser.executeAsyncScript(function () {
     |             ^
  75 |               var callback = arguments[arguments.length - 1]
  76 |               if (window.__NEXT_HYDRATED) {
  77 |                 callback()

  at Object.throwDecodedError (../node_modules/selenium-webdriver/lib/error.js:550:15)
  at parseHttpResponse (../node_modules/selenium-webdriver/lib/http.js:565:13)
  at Executor.execute (../node_modules/selenium-webdriver/lib/http.js:491:26)
      at runMicrotasks (<anonymous>)
  at Proxy.execute (../node_modules/selenium-webdriver/lib/webdriver.js:700:17)
  at Object.patch (acceptance/helpers.js:74:13)
  at Object.<anonymous> (acceptance/ReactRefreshLogBox.dev.test.js:1422:3)

[styfle]

Thanks!

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
buildDuration	13.4s	17s	⚠️ +3.7s
buildDurationCached	3.4s	3.3s	-57ms
nodeModulesSize	61.5 MB	61.5 MB	⚠️ +2 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.37	2.343	-0.03
/ avg req/sec	1054.86	1066.94	+12.08
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.33	1.312	-0.02
/error-in-render avg req/sec	1880.09	1905.62	+25.53

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
745.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	23.2 kB	23.2 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	67.1 kB	67.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
_app-HASH.js gzip	979 B	979 B	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	329 B	329 B	✓
dynamic-HASH.js gzip	2.65 kB	2.65 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	918 B	918 B	✓
image-HASH.js gzip	4.13 kB	4.13 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	318 B	318 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	12.9 kB	12.9 kB	✓

Client Build Manifests

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
_buildManifest.js gzip	492 B	492 B	✓
Overall change	492 B	492 B	✓

Rendered Page Sizes

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
index.html gzip	539 B	539 B	✓
link.html gzip	551 B	551 B	✓
withRouter.html gzip	532 B	532 B	✓
Overall change	1.62 kB	1.62 kB	✓

---

Webpack 4 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
buildDuration	11.2s	11.1s	-65ms
buildDurationCached	4.7s	4.7s	-37ms
nodeModulesSize	61.5 MB	61.5 MB	⚠️ +2 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.375	2.376	0
/ avg req/sec	1052.5	1052.02	⚠️ -0.48
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.339	1.303	-0.04
/error-in-render avg req/sec	1866.5	1919.11	+52.61

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
16.HASH.js gzip	186 B	186 B	✓
677f882d2ed8..HASH.js gzip	14.1 kB	14.1 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	10.6 kB	10.6 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	68 kB	68 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
_app-HASH.js gzip	964 B	964 B	✓
_error-HASH.js gzip	3.8 kB	3.8 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.85 kB	2.85 kB	✓
head-HASH.js gzip	3.06 kB	3.06 kB	✓
hooks-HASH.js gzip	924 B	924 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	298 B	298 B	✓
script-HASH.js gzip	2.98 kB	2.98 kB	✓
withRouter-HASH.js gzip	295 B	295 B	✓
30809af5c834..565.css gzip	125 B	125 B	✓
Overall change	18.1 kB	18.1 kB	✓

Client Build Manifests

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
_buildManifest.js gzip	500 B	500 B	✓
Overall change	500 B	500 B	✓

Rendered Page Sizes

	vercel/next.js canary	ctjlewis/next.js patch-1	Change
index.html gzip	585 B	585 B	✓
link.html gzip	597 B	597 B	✓
withRouter.html gzip	578 B	578 B	✓
Overall change	1.76 kB	1.76 kB	✓

Commit: 804aeb1