Updating the Security Contact Us Details

[aw126]

This PR is to update the bug bounty link and remove the outdated Contact Us links.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.34%. Comparing base (71a25bc) to head (1063a38).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1083      +/-   ##
==========================================
- Coverage   36.55%   34.34%   -2.21%     
==========================================
  Files         101       93       -8     
  Lines       14350    14105     -245     
==========================================
- Hits         5245     4844     -401     
- Misses       8158     8319     +161     
+ Partials      947      942       -5     

Flag	Coverage Δ
integration_tests	25.79% <ø> (ø)
integration_tests_byzantine	11.27% <ø> (ø)
integration_tests_gov	11.54% <ø> (ø)
integration_tests_grpc	11.54% <ø> (ø)
integration_tests_ibc	27.52% <ø> (ø)
integration_tests_ledger	11.53% <ø> (ø)
integration_tests_slow	11.53% <ø> (ø)
integration_tests_solomachine	11.32% <ø> (ø)
integration_tests_upgrade	11.54% <ø> (ø)
unit_tests	?

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