HTTPS is broken when loading speaker providers

[Crevil]

The site is served over HTTPS but if the webpage tries to load a resource from a non-HTTP destination, the entire site is marked as insecure as we can no longer trust the contents served.

Here is an example of such a request. This is from https://cloudnativenordics.com/meetup-groups/Cloud-Native-Aarhus when you scroll past MHI Vestas Offshore Wind in the Speaker providers section.

The source of the non-HTTPS resource is here:

meetups/companies.yaml

Lines 439 to 442 in f0a53cc

	- id: mhivestas
	logoURL: http://www.mhivestasoffshore.com/wp-content/uploads/2015/02/MHI_Vestas_Logo_130px.png
	name: MHI Vestas Offshore Wind
	websiteURL: http://www.mhivestasoffshore.com//

I would have provided a PR with the HTTPS scheme, but MHI Vestas does not serve the contents over HTTPS.

[Steiniche]

Thanks for reporting this.
It seems like we have to choose either to show no logo or have a page which is "insucure".
Right now I believe the best solution is to remove the logo until we can find one at a secure location.