feat: github actions to build and publish

- add templates for issues and pull request
- small cleanup in README

.github/ISSUE_TEMPLATE/1-bug.md

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+---
+name: 🐛 Bug report
+about: Report a bug you found when using flant-statusmap-panel
+labels: 'bug'
+---
+<!--
+           Thank you for sending a bug report! Here are some tips:
+
+1. Please fill out the template below to make it easier to debug your problem.
+2. If you are not sure if it is a bug or not, you can ask in Discussions.
+
+PROTIP: record your screen and attach it as a gif to showcase the issue.
+
+- Questions should be posted to: https://github.com/flant/grafana-statusmap/discussions
+- Use query inspector to troubleshoot issues: https://bit.ly/2XNF6YS
+- How to record and attach gif: https://bit.ly/2Mi8T6K
+-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Environment**:
+- Grafana version:
+- flant-statusmap-panel version:
+- Data source type & version:
+- OS Grafana is installed on:
+- User OS & Browser:
+- Grafana plugins:
+- Others:
+
+**Anything else we should know?**:
+

.github/ISSUE_TEMPLATE/2-feature.md

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+---
+name: 💡 Feature request 
+about: Suggest an idea for flant-statusmap-panel
+labels: 'enhancement'
+---
+
+<!-- Please only use this template for submitting feature requests. -->
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 💬 Questions & Help
+    url: https://github.com/flant/grafana-statusmap/discussions
+    about: Please ask and answer questions here