docs: fix README typos, broken example, and duplicated section

[Tarunswamy-Muralidharan]

Fixes #114

This is a focused, surgical fix for the documentation issues that keeps the existing README structure intact while correcting all known errors:

Fixes

• Typo: 'Preresequisits' → 'Prerequisites'
• Typo: 'recomended' → 'recommended'
• Typo: 'configs.ini' → 'config.ini'
• Typo: 'achive' → 'achieve'
• Typo: 'Recieving' → 'Receiving'
• Grammar: 'If no of steps above happen' → 'If none of the steps above happen'
• Broken example: Fixed en-dash (–-) in gh review --auto_merge to proper double hyphen (--) — copy-pasting the old example would fail
• Missing docs: Added --no_iteration to the excluding-features list
• Missing docs: Added pip install -r requirements.txt as the primary install path
• Duplicated section: Removed the accidentally duplicated 'Last production deployment' block

Why this approach

Instead of restructuring the entire README, this PR preserves the existing style and fixes the specific bugs. Smaller diffs are easier to review and less likely to introduce new issues.

Verification

• git diff --check passes
• npx --yes markdownlint-cli --disable MD013 MD033 MD041 -- README.md passes

[Tarunswamy-Muralidharan]

Hi @zigcBenx — this is a focused, surgical fix that addresses all the README issues without rewriting the entire document:

• Fixes 5+ typos (Preresequisits, recomended, configs.ini, achive, Recieving)
• Fixes the broken gh review --auto_merge example (was using an en-dash instead of double-hyphen)
• Removes the duplicated "Last production deployment" section (~30 lines)
• Adds missing --no_iteration flag documentation
• Keeps the original README style and structure intact

Unlike the earlier PRs that proposed larger rewrites, this change is minimal and review-friendly. Hope it helps!