Fix for "Simplify dependencies handling for exercises in katas" #1640

[ggridin]

Link to the issue: #1640

The following changes were done:

1. qsDependencies property is no longer processing (generate_katas_content.js)
2. ../KatasLibrary.qs is included as implicit dependency
3. ./Common.qs is included as implicit dependency if present in current kata
4. All qsDependencies properties are removed from index.md's
5. README.md is updated - reference to qsDependencies is removed

Testing done:

1. "Happy path": Windows cmd build: "python ./build.py --wasm --npm --play" - success
   Local playground manual testing - no impact (Chrome and Edge)
2. No impact when qsDependencies are present in index.md
3. No impact when qsDependencies are present and empty in index.md

Question: should Ubuntu build be tested?

[tcNickolas]

Can you please sign the CLA? We need it to be able to accept your contribution

[ggridin]

@microsoft-github-policy-service agree

[tcNickolas]

Looks good to me! Can't think of any additional scenarios to test that would not be caught by the multi-platform CI builds

Thank you!

[cesarzc]

Looks good, thank you for this contribution!