docs(readme): Update for clarity and image sources

[ReenigneArcher]

Description

Improved alt text for images, clarified documentation links, and switched contributor/sponsor image sources to use jsdelivr CDN for reliability. Removed anchor tags around images for a cleaner layout.

Screenshot

Issues Fixed or Closed

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[codecov]

Bundle Report

Bundle size has no change ✅

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 12.09%. Comparing base (dbe38ba) to head (45c6c97).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #4384    +/-   ##
========================================
  Coverage   12.09%   12.09%            
========================================
  Files          87       87            
  Lines       17612    17612            
  Branches     8097     8097            
========================================
  Hits         2131     2131            
- Misses      14579    14758   +179     
+ Partials      902      723   -179     

Flag	Coverage Δ
Linux-AppImage	11.62% <ø> (ø)
Windows-AMD64	13.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 21 files with indirect coverage changes