chore: fix image centering in integration test

[amagyar-iohk]

Description:

Rolled back style="text-align: center" to align="center" for readme in integration test

Checklist:

• [x] My PR follows the contribution guidelines of this project
• [x] My PR is free of third-party dependencies that don't comply with the Allowlist
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked the PR title to follow the conventional commit specification

[github-actions[bot]]

Integration Test Results

16 files  ±0  16 suites  ±0   2s :stopwatch: ±0s 34 tests ±0  34 :white_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  59 runs  ±0  59 :white_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 225ee0ed. ± Comparison against base commit c05df452.

[github-actions[bot]]

Unit Test Results

 96 files  ±0   96 suites  ±0   22m 52s :stopwatch: -14s 826 tests ±0  818 :white_check_mark: ±0  8 :zzz: ±0  0 :x: ±0  833 runs  ±0  825 :white_check_mark: ±0  8 :zzz: ±0  0 :x: ±0 

Results for commit 225ee0ed. ± Comparison against base commit c05df452.