Update Academy topics that touch the Actor creation and Git integration

[szaganek]

Some Academy topics need a refresh because of the recent changes:

• For Actors in Git repositories you can enable automated builds in Console
• apify create comes with more options to define (for example where to host the code)

Wizard transcripts are incomplete:

• https://docs.apify.com/academy/expert-scraping-with-apify/solutions/integrating-webhooks
• https://docs.apify.com/academy/expert-scraping-with-apify/solutions/using-api-and-client
• https://docs.apify.com/academy/scraping-basics-python/platform

You can create a repo during Actor creation: https://docs.apify.com/academy/expert-scraping-with-apify/managing-source-code
The apify push works with more than just GH: https://docs.apify.com/academy/expert-scraping-with-apify/solutions/managing-source

There're probably a few more.