chore: Misc cleaning

[rschristian]

What kind of change does this PR introduce?

Chore

Did you add tests for your changes?

N/A

Summary

• ReadMe
  • Corrected required Node version in the ReadMe
  • Removed the deployment section as it hasn't been valid or useful for a while
  • Edited the --refresh flag to match the CLI description
  • Added in missing table of contents entries for env vars & route-based code splitting
• Updated yarn.lock as it had some outdated items that we no longer used
• Updated browserslist
• Cleared out a couple TODOs that have sat untouched for years and would never get done.
• Removes setHtmlTemplate helper
  • This has been non-functional for a fairly long time, is redundant, and no one has seemed to notice, so a silent removal shouldn't be problematic?

Note: Two tests should be failing at the moment, due to the .babelrc sat in the default template. I've opened a PR to remove it. The tests here should fail until that's gone. Merged, all good now

Does this PR introduce a breaking change?

N/A

[changeset-bot]

🦋 Changeset detected

Latest commit: 5a0448f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
preact-cli	Patch

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[ForsakenHarmony]

should this have a changeset?

[rschristian]

Yes, yes it should. Sorry about that.