give proper intro text to #ASKtraining

[timmwille]

Currently there is no clear description of what ASKtraining is "create your custom training plan" ("effortlessly" can also be removed) → but why does it exist, what is its #ASKnet context (link to website) etc in short

@walthierer maybe you can help with this one?

My suggestion:

The "Access to Skills and Knowledge" training planner serves as a tool within our network #ASKnet of experts to work with our Open Educational Resources (training modules with attached learning resources).