Update OpenMBEE project page on NumFOCUS Website

[lewismc]

The OpenMBEE project page on the NumFOCUS Website is convoluted, confusing and of little utility. It doesn't represent the OpenMBEE project well and we could do a much better job if it was simplified to focus on project features.
This ticket involves developing new content for the product pitch and then approaching NumFOCUS via their Slack channel in order to update the content.

[lewismc]

I reached out on the NumFOCUS Slack channel and was directed to Samina Trachier who is the NumFOCUS Events & Digital Marketing Manager. We need to write to her on the NumFOCUS Slack channel with any updates we wish to make.