There should be a way to get all GitHub organizations when generating talks

[schettn]

Describe the feature or change you'd like
It is currently not possible to filter organization by platform name. Therefore, all organizations are selected for the process of generating talks, including those from Gitlab. This leads to an error because the talk util currently only works with GitHub organizations.

To achieve this following changes are required:

• 1. Add the platformName to the organizations in reducer
• 2. Adjust query statements for organizations
• 3. Adjust platform name filter in talk generating process