Fix links in Issue and PR Template (#5186)

* Fixing links to the openwhisk website

* Fixing a link to the style guide as well

Author: klcodanr

.github/ISSUE_TEMPLATE.md

@@ -1,5 +1,5 @@
 <!--
-We use the issue tracker for bugs and feature requests. For general questions and discussion please use http://slack.openwhisk.org/ or https://openwhisk.apache.org/contact.html instead.
+We use the issue tracker for bugs and feature requests. For general questions and discussion please use https://openwhisk.apache.org/slack.html or https://openwhisk.apache.org/community.html instead.
 
 Do NOT share passwords, credentials or other confidential information.
 

.github/PULL_REQUEST_TEMPLATE.md

@@ -36,7 +36,7 @@
 <!--- Please review the points below which help you make sure you've covered all aspects of the change you're making. -->
 
 - [ ] I signed an [Apache CLA](https://github.com/apache/openwhisk/blob/master/CONTRIBUTING.md).
-- [ ] I reviewed the [style guides](https://github.com/apache/openwhisk/wiki/Contributing:-Git-guidelines#code-readiness) and followed the recommendations (Travis CI will check :).
+- [ ] I reviewed the [style guides](https://github.com/apache/openwhisk/blob/master/CONTRIBUTING.md#coding-standards) and followed the recommendations (Travis CI will check :).
 - [ ] I added tests to cover my changes.
 - [ ] My changes require further changes to the documentation.
 - [ ] I updated the documentation where necessary.