Updated Angular Training's Monthly Workshops image logo to a square image

[alcfeoh]

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [X] Other... Please describe: Better images

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[geromegrignon]

I merged it in another commit as the workshop was already added in another commit and it was just about the logo here.