Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## **Environment**
+- OS: [e.g. Ubuntu 21.04]
+- web-greeter version: output of `web-greeter --version`
+
+## **Bug description**
+A clear and concise description of what the bug is.
+
+## **Steps to reproduce**
+Steps to reproduce the behavior.
+
+## **Expected behavior**
+A clear and concise description of what you expected to happen.
+
+## **Screenshots**
+If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## **Environment**
+- OS: [e.g. Ubuntu 21.04]
+- web-greeter version: output of `web-greeter --version`
+
+## **Description of feature**
+A clear and concise description of what you want to happen.
+
+## **Possible solutions**
+Add alternatives solutions to this feature or problem.