V2-Add cheat sheets for AWS, Redis, Linux, Svelte, Express.js, and PostgreSQL

[dinilH]

Description

Added new cheat sheet resources for technologies that were missing or had limited coverage in the free-programming-cheatsheets collection.

Changes Made

New Sections Added (5):

1. AWS - Added 3 comprehensive resources

   • AWS CLI Cheatsheet (devhints)
   • AWS Services Cheat Sheet (Digital Cloud Training)
   • AWS Solutions Architect Cheat Sheet (Tutorials Dojo)

2. Redis - Added 2 resources

   • Redis Quick Reference (Official documentation)
   • Redis Cheat Sheet (lzone.de)

3. Linux - Added 3 resources

   • Bash Scripting Cheat Sheet (devhints)
   • Linux Command Line Cheat Sheet (Cheatography)
   • Linux Commands Cheat Sheet (GeeksforGeeks)

4. Svelte - Added 2 resources

   • Svelte Cheatsheet (devhints)
   • Svelte Quick Reference (Official Svelte docs)

Enhanced Existing Sections (2):

5. Node.js/Express.js - Added 1 resource

   • Express.js Cheat Sheet (QuickRef.ME)

6. SQL/PostgreSQL - Added 2 PostgreSQL-specific resources

   • PostgreSQL Cheat Sheet (QuickRef.ME)
   • PostgreSQL Quick Reference (PostgreSQL Tutorial)

Resource Quality

All added resources are from reputable sources:

• Official documentation (AWS, Svelte, PostgreSQL, Redis)
• Established educational platforms (GeeksforGeeks, Cheatography)
• Trusted developer resources (devhints.io, QuickRef.ME, Tutorials Dojo)

These are widely-used technologies in modern development, making these resources valuable for the community.

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Note: This PR is part of Hacktoberfest 2025 🎃