clean template files

[epassaro]

Description

• Remove issue template
• Remove PR template
• CODE OF CONDUCT.md ?
• CONTRIBUTING.md ?
• FUNDING.md ?

Motivation and Context

In order to use the common templates stored at https://github.com/tardis-sn/.github we need to remove those files from every repo (otherwise these files are overwritten).

To see the list of files that can be shared through the https://github.com/tardis-sn/.github repository check: https://docs.github.com/en/github/building-a-strong-community/creating-a-default-community-health-file

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Other (please describe)

No testing.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #1538 (f4f6816) into master (c14b2cd) will not change coverage.
The diff coverage is n/a.

❗ Current head f4f6816 differs from pull request most recent head 2c0f651. Consider uploading reports for the commit 2c0f651 to get more accurate results

@@           Coverage Diff           @@
##           master    #1538   +/-   ##
=======================================
  Coverage   67.57%   67.57%           
=======================================
  Files          68       68           
  Lines        6103     6103           
=======================================
  Hits         4124     4124           
  Misses       1979     1979           

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