add member to 3-col grid

[bbrcknl]

The 3-col grid on the membership page did not have the Cyberagentur logo. (The single column mobile grid did show it.)

[github-actions]

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The link checker found some issues!

Running 3 checks (Scripts, Links, Images) in ["_site"] on *.html files...


Checking 422 external links
Checking 646 internal links
Checking internal link hashes in 18 files
Ran on 62 files!


For the Links > External check, the following failures were found:

* At _site/Foundation/Jobs/index.html:243:

  External link https://hensoldt-cyber.com/job-offers failed (status code 404)

* At _site/Foundation/Summit/2022/index.html:146:

  External link https://hensoldt-cyber.com/sel4-summit-2022/ failed (status code 404)

* At _site/news/2021.html:301:

  External link https://hensoldt-cyber.com/2021/07/07/trentos-a-secure-operating-system-on-top-of-sel4-camkes/ failed (status code 404)


HTML-Proofer found 3 failures!
make: *** [Makefile:59: checklinks] Error 1

[github-actions]

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The HTML5 validator found some issues!

Error: Stray end tag "a".
From line 146, column 112; to line 146, column 115 in resource file:_site/Foundation/Summit/2022/index.html
Document checking completed.

[github-actions]

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The link checker found some issues!

Running 3 checks (Scripts, Links, Images) in ["_site"] on *.html files...


Checking 419 external links
Checking 646 internal links
Checking internal link hashes in 18 files
Ran on 62 files!


For the Links > External check, the following failures were found:

* At _site/Foundation/Summit/2024/index.html:407:

  External link https://www.linkedin.com/in/alison-felizzi-991244189 failed (status code 429)

* At _site/Foundation/Summit/2024/index.html:410:

  External link https://www.linkedin.com/in/alison-felizzi-991244189 failed (status code 429)

* At _site/news/2024.html:727:

  External link https://www.linkedin.com/in/alison-felizzi-991244189 failed (status code 429)

* At _site/news/2024.html:731:

  External link https://www.linkedin.com/in/alison-felizzi-991244189 failed (status code 429)


HTML-Proofer found 4 failures!
make: *** [Makefile:59: checklinks] Error 1