Remove SDK docs since they're migrated to main docs

[marcduiker]

Description

Remove SDK docs since they're migrated to the main Dapr Docs.
This Docs PR merges the Python SDK docs: dapr/docs#4949 (The main Docs PR needs to be merged before this PR).

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: dapr/docs#4943

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.31%. Comparing base (bffb749) to head (394b02c).
⚠️ Report is 52 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #866      +/-   ##
==========================================
+ Coverage   86.63%   87.31%   +0.68%     
==========================================
  Files          84       96      +12     
  Lines        4473     6315    +1842     
==========================================
+ Hits         3875     5514    +1639     
- Misses        598      801     +203     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.