Remove references to JIRA in the docs (#659)

* Update README.md to remove JIRA references
* Update CONTRIBUTING.md to remove JIRA references

---------

Co-authored-by: Marcus Ortiz <[email protected]>

Author: 0xTim

CONTRIBUTING.md

@@ -35,7 +35,7 @@ from the community.
 ### Contributing Code and Documentation
 
 Before contributing code or documentation to Swift-DocC-Render
-we encourage you to first create an issue on [Swift JIRA](https://bugs.swift.org/)
+we encourage you to first create an issue on [GitHub](https://github.com/apple/swift-docc-render/issues/new/choose)
 for a bug report or feature request.
 This will allow us to provide feedback on the proposed change.
 However, this is not a requirement. If your contribution is small in scope,
@@ -125,8 +125,8 @@ When you're ready to have your change reviewed, please make sure you've complete
 When opening a pull request, please make sure to fill out the pull request template
 and complete all tasks mentioned there.
 
-Your PR should mention the number of the [Swift JIRA](https://bugs.swift.org/)
-issue your work is addressing (SR-NNNNN).
+Your PR should mention the number of the [GitHub issue](https://github.com/apple/swift-docc-render/issues)
+issue your work is addressing (#NNN).
 
 Most PRs should be against the `main` branch. If your change is intended 
 for a specific release, you should also create a separate branch 
@@ -184,8 +184,8 @@ npm run lint:fix
 ## Your First Contribution
 
 Unsure of where to begin contributing to Swift-DocC-Render? You can start by looking at
-the bugs in the `Swift-DocC-Render` component with the `StarterBug` label on
-[Swift JIRA](https://bugs.swift.org/issues/?jql=project%20%3D%20SR%20AND%20status%20in%20(Open%2C%20Reopened)%20AND%20component%20%3D%20Swift-DocC-Render%20AND%20labels%20%3D%20StarterBug).
+the bugs in the `Swift-DocC-Render` issues list with the `StarterBug` label on
+[GitHub](https://github.com/apple/swift-docc-render/issues?q=is%3Aissue+is%3Aopen+label%3AStarterBug).
 
 Once you've found an issue to work on,
 follow the above instructions for [Building Swift-DocC-Render](#build-and-run-swift-docc-render).

README.md

@@ -51,7 +51,7 @@ To build the docs, run `npm run docs:build`.
 
 ### Submitting a Bug Report
 
-Swift-DocC-Render tracks all bug reports with [Swift JIRA](https://bugs.swift.org/).
+Swift-DocC-Render tracks all bug reports with [GitHub](https://github.com/apple/swift-docc-render/issues).
 When you submit a bug report we ask that you follow the
 Swift [Bug Reporting](https://swift.org/contributing/#reporting-bugs) guidelines
 and provide as many details as possible.
@@ -63,7 +63,7 @@ that will help us track down the bug faster.
 ### Submitting a Feature Request
 
 For feature requests, please feel free to create an issue
-on [Swift JIRA](https://bugs.swift.org/) with the `New Feature` type
+on [GitHub](https://github.com/apple/swift-docc-render/issues/new?assignees=&labels=New+Feature&projects=&template=FEATURE_REQUEST.yml) with the `New Feature` type
 or start a discussion on the [Swift Forums](https://forums.swift.org/c/development/swift-docc).
 
 Don't hesitate to submit a feature request if you see a way