README.md: Remove obsolete requirement for openssl binary

[markstos]

Also, remove the entire install section. People who are installing a technical encryption node module rarely need that.

Summary by CodeRabbit

• Documentation
  • Adjusted README structure by lowering the “Upgrading” heading for consistency.
  • Removed the “Install” section, including installation steps and the OpenSSL prerequisite note.
  • Updated upgrade guidance to emphasize migrating to the newer references approach and to reference verifying XML documents; deprecation warnings and help guidance retained.
  • No changes to product behavior or public APIs; documentation-only updates.

[coderabbitai]

Walkthrough

Documentation-only changes: the README's "Upgrading" heading was demoted from H1 to H2, the entire "Install" section (npm instructions and OpenSSL note) was removed, and upgrade guidance was adjusted to emphasize migrating to getSignedReferences() and verifying XML. No code, API, or error-handling changes.

Changes

Cohort / File(s)	Summary
Docs: README README.md	Demoted "Upgrading" from # to ##; removed the entire "Install" section (npm install instructions and OpenSSL prerequisite); revised upgrade guidance to reference getSignedReferences() and XML verification. No functional/API changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

I twitch my whiskers, docs made light,
One heading down, install takes flight.
Lines trimmed tidy, guidance now clear,
The code sits calm — no changes near.
Hop-hop — a rabbit's tiny cheer. 🐇✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly describes the primary documentation update by indicating the removal of the obsolete OpenSSL binary requirement from the README.md, accurately reflecting the changeset’s main focus on cleaning up the install instructions.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch markstos-remove-install-from-README

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 525ac6d and 1f61214.

📒 Files selected for processing (1)

• README.md (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• README.md

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