Update issue templates

Author: jmillan

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in JsSIP
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+# Bug Report
+
+**IMPORTANT:** We primarily use GitHub Issues as an issue tracker. Just open an issue here if you have encountered a bug in JsSIP.
+
+If you have questions or doubts about JsSIP or need support, please use the GitHub Discussions instead:
+
+https://github.com/versatica/JsSIP/discussions
+
+If you have found a bug in the software, please delete this text and continue :).
+
+## Your environment
+
+- JsSIP version:
+
+## Issue description
+
+## Full JsSIP logs

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea or improvement for JsSIP
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+# Feature Request