Update the logo consistently throughout all materials

[brianking]

From @berezovskyi on October 7, 2017 17:26

• [x] https://www.youtube.com/c/OpenServicesDotNet (#13)

• [ ] open-services website

• [ ] open-services Twitter

• [x] open-services Discourse

• [ ] add logo to the http://www.wikiwand.com/en/Open_Services_for_Lifecycle_Collaboration ? (#12)

• [ ] https://twitter.com/eclipselyo

• [ ] https://www.eclipse.org/lyo/

• [ ] https://www.linkedin.com/groups/3957829/profile

• [ ] https://github.com/OSLC

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please edit to add the forgotten places where the logo needs to be updated

Copied from original issue: OSLC/oslc-community#14

[brianking]

Once #9 is done, we can do this.