removed img tag and created div with neccasery styles

[svandeneertwegh]

Description

• Removed img tag.
• Added div buttons with propriate backgound-image base64 image.

Checklist

• [x] I have opened this pull request against master
• [ ] I have added or modified the tests when changing logic
• [ ] I have followed the conventional commits guidelines to add meaningful information into the changelog
• [ ] I have read the contribution guidelines and I have joined #workgroup-pr-review on Slack to find a “pr review buddy” who is going to review my pull request.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d709b02) 33.24% compared to head (bc1b562) 33.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #51 +/- ## ======================================= Coverage 33.24% 33.24% ======================================= Files 17 17 Lines 728 728 Branches 71 71 ======================================= Hits 242 242 Misses 485 485 Partials 1 1 ``` | [Files Changed](https://app.codecov.io/gh/django-cms/djangocms-history/pull/51?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=django-cms) | Coverage Δ | | |---|---|---| | [djangocms\_history/cms\_toolbars.py](https://app.codecov.io/gh/django-cms/djangocms-history/pull/51?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=django-cms#diff-ZGphbmdvY21zX2hpc3RvcnkvY21zX3Rvb2xiYXJzLnB5) | `0.00% <0.00%> (ø)` | |

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[fsbraun]

@svandeneertwegh Great work! I think two images might have been mixed up. Can you double-check?