Remove templates

[albertteoh]

Signed-off-by: albertteoh albert.teoh@logz.io

Which problem is this PR solving?

• Relates to Org-wide issue/PR templates jaeger#2974

Short description of the changes

• Removes template files which are now redundant with the introduction of org-wide templates.

[codecov]

Codecov Report

Merging #312 (22e1ac4) into master (68ba51d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #312   +/-   ##
=======================================
  Coverage   95.33%   95.33%           
=======================================
  Files          23       23           
  Lines        1931     1931           
  Branches      272      272           
=======================================
  Hits         1841     1841           
  Misses         56       56           
  Partials       34       34           

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