Create Blagslide

[spier]

For presentations we frequently need a "brag slide", i.e. an overview of all known InnerSource adopters.

We already have the stories page with an overview of all adopters.
However we cannot easily copy all company images from there as the page is too large to fit into a slide.

In this PR I am creating a new page, that isn't liked from anywhere. It is located at:
/stories/bragslide/

It shows all the logos in a much more dense form, and with smaller logo images.

Left to do:

• prevent duplicating all the company data in two files - can I load that data from a separate file into two pages?
• fix logo for sourcegraph (apparently the .svg does not work in the bragslide yet
• determine now to call this thing. bragslide might not be proper :)

Current status:

[OliveCannon]

Hi, Sebastian, could you look at this request as it is showing as an error when I try to open the origin Master file

[spier]

Status update:
The issues that @OliveCannon was having had nothing to do with this branch here. We were able to resolve the issue, and this PR is fine to stay as is.