Remove unnecessary urls from README

[Yang-33]

• Community Q&A site was closed.
• The SDK team no longer posts information to Twitter

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.15%. Comparing base (7b7ac4e) to head (1c4ef83).

❗ Current head 1c4ef83 differs from pull request most recent head f149fbf. Consider uploading reports for the commit f149fbf to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #432   +/-   ##
=======================================
  Coverage   55.15%   55.15%           
=======================================
  Files          87       87           
  Lines        5483     5483           
=======================================
  Hits         3024     3024           
  Misses       2237     2237           
  Partials      222      222           

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