docs(repo): prepare v0.8.5 documentation refresh

[ikelaiah]

What does this PR do?

Prepares the v0.8.5 documentation and project-identity release.

• Adds a new project banner with an editable SVG source and synchronized PNG.
• Simplifies and reorganizes the README around pool selection, quick start, lifecycle, and error handling.
• Adds a concise API cheat sheet for common operations and safety rules.
• Adds v0.8.5 release notes.
• Updates the changelog and Lazarus package metadata to 0.8.5.
• Adds a few purposeful emoji callouts while keeping headings clean.

This release does not change runtime behavior or the public API.

Related issue

N/A

Type of change

• 🐛 Bug fix
• ✨ New feature
• 📝 Documentation / examples
• 🔧 Refactor / internal change

Checklist

• Tests pass locally (lazbuild tests/TestRunner.lpi then run TestRunner)
  • 58 tests passed with zero errors, failures, or heap leaks.
• Added/updated tests where it makes sense
  • Not applicable: this PR contains documentation, branding, and package metadata changes only.
• Updated CHANGELOG.md
• Updated docs in docs/ if behavior or API changed
  • No behavior or API changes; documentation and release notes were updated.
• New units use {$mode objfpc}{$H+}{$J-} and filenames match unit casing
  • Not applicable: no new Pascal units were added.