Use #image_resize from vectory

[alexeymorozov]

See https://github.com/metanorma/vectory/issues/28

Metanorma PR checklist

• [ ] Breaking changes (list related PRs)
• [ ] Documentation update required (create task for this)
• [ ] External dependency introduced (documentation update need)
• [ ] Gem with native library introduced

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d4310c4) 95.02% compared to head (6c852a1) 95.02%.

:exclamation: Current head 6c852a1 differs from pull request most recent head 8e68cc5. Consider uploading reports for the commit 8e68cc5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #89 +/- ## ======================================= Coverage 95.02% 95.02% ======================================= Files 7 7 Lines 523 523 ======================================= Hits 497 497 Misses 26 26 ```

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