docs: replace redirected or missing links to bolt documentation

[zimeg]

Summary

This PR replaces redirected or unexpected links related to tools.slack.dev ✨

Some of these were found with searches for "https://slack.dev" and some were found in outputs from npm run build for docs 📚

Preview

Before changes

[WARNING] Docusaurus found broken links!

Please check the pages of your site in the list below, and make sure you don't reference any path that does not exist.
Note: it's possible to ignore broken links with the 'onBrokenLinks' Docusaurus configuration, and let the build pass.

Exhaustive list of all broken links found:
- Broken link on source page path = /bolt-js/reference:
   -> linking to /bolt-js/concepts/steps-from-apps
   -> linking to /bolt-js/tutorial/using-typescript
   -> linking to /bolt-js/concepts/acknowledging-events

Notes

• Some links in Japanese translations are broken due to missing sections or pages. I was hoping to add a CI check that'd fail for broken links, but will hold off on that here 🙏

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.59%. Comparing base (34b93ab) to head (607a76b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2367   +/-   ##
=======================================
  Coverage   92.59%   92.59%           
=======================================
  Files          36       36           
  Lines        7472     7472           
  Branches      653      653           
=======================================
  Hits         6919     6919           
  Misses        545      545           
  Partials        8        8           

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[lukegalbraithrussell]

we bless edengod on this day

[zimeg]

@lukegalbraithrussell Blessed be the reviewer too!

I found a few more complete links to https://tools.slack.dev/bolt-js/... within docs, which were replaced with the absolute alternative in 607a76b. Otherwise, I am thinking it's merge time 🚢 💨

[zimeg]

This page was removed in 52687bf but I believe the included example is alright for getting started here!

[zimeg]

Love to see tests that are checking for this error code!

bolt-js/test/unit/App/basic.spec.ts

Lines 111 to 119 in 34b93ab

	it('should fail without a token for single team authorization, authorize callback, nor oauth installer', async () => {
	const MockApp = await importApp();
	try {
	new MockApp({ signingSecret: '' });
	assert.fail();
	} catch (error) {
	assert.propertyVal(error, 'code', ErrorCode.AppInitializationError);
	}
	});