docs: add info around next version, testing other projects

[flotwig]

• Closes Investigate and document 'next version' testing of example apps #19138

User facing changelog

n/a

Additional details

• Created a guides directory for stuff like this so we don't have to keep tacking it on to DEPLOY.md or CONTRIBUTING.md.
• Added a guide for determining next version and for testing other projects.
• Moved DEPLOY.md to guides.

How has the user experience changed?

PR Tasks

• [na] Have tests been added/updated?
• [na] Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• [na] Has a PR for user-facing changes been opened in cypress-documentation?
• [na] Have API changes been updated in the type definitions?
• [na] Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[cypress]

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Test summary

18709 • 0 • 202 • 0 • 5

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Run details

Project	cypress
Status	Passed
Commit	d4d1358
Started	Dec 2, 2021 3:39 PM
Ended	Dec 2, 2021 3:51 PM
Duration	11:52 💡
OS	Linux Debian - 10.10
Browser	Multiple

View run in Cypress Dashboard ➡️

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Flakiness

	commands/net_stubbing_spec.ts		2
1	network stubbing > waiting and aliasing > can timeout waiting on a single request using "alias.request"
2	network stubbing > waiting and aliasing > can timeout waiting on a single request using "alias.request"
	settings_spec.js		1
1	Settings > file preference panel > loads preferred editor, available editors and shows spinner
	commands/navigation_spec.js		1
1	src/cy/commands/navigation > #visit > window immediately resolves and doesn't reload when visiting the same URL with hashes
	cypress/proxy-logging-spec.ts		1
1	Proxy Logging > request logging > xhr log has response body/status code

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[emilyrohrbough]

Is there an link to how this process works?

[flotwig]

The on package has some docs, I'm actually not sure how it works with the new docs since sidebar is no longer YAML, looking into it.

[flotwig]

cc @amirrustam

[flotwig]

But for now, let's not let this block this PR

[emilyrohrbough]

Nice job on this!