Renaming conduct to code of conduct and contributing files to .md (redis#10941)

CONTRIBUTING to get better formatting
CONDUCT also because github doesn't seem recognize the code of conduct page

Co-authored-by: Oran Agra <[email protected]>

Author: adasarpan404

CONDUCT renamed to CODE_OF_CONDUCT.md

@@ -93,4 +93,4 @@ Community Impact Guidelines were inspired by Mozilla’s code of conduct
 enforcement ladder.
 For answers to common questions about this code of conduct, see the FAQ at
 https://www.contributor-covenant.org/faq. Translations are available at
-https://www.contributor-covenant.org/translations.
+https://www.contributor-covenant.org/translations.

CONTRIBUTING renamed to CONTRIBUTING.md

@@ -223,11 +223,11 @@ public discussion groups, you agree to release your code under the terms
 of the BSD license that you can find in the [COPYING][1] file included in the Redis
 source distribution.
 
-Please see the [CONTRIBUTING][2] file in this source distribution for more
+Please see the [CONTRIBUTING.md][2] file in this source distribution for more
 information. For security bugs and vulnerabilities, please see [SECURITY.md][3].
 
 [1]: https://github.com/redis/redis/blob/unstable/COPYING
-[2]: https://github.com/redis/redis/blob/unstable/CONTRIBUTING
+[2]: https://github.com/redis/redis/blob/unstable/CONTRIBUTING.md
 [3]: https://github.com/redis/redis/blob/unstable/SECURITY.md
 
 Redis internals