Update issue templates for Kubeapps (#4626)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: kind/bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - Version [e.g. 2.4.4]
+ - Kubernetes version [e.g. 1.21.10]
+ - Package version [e.g. Helm 3.2, carvel-imgpkg 0.28.0]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature for Kubeapps
+title: ''
+labels: kind/feature
+assignees: ''
+
+---
+
+**Summary**
+Brief description about the change you want to perform. "The what"
+
+**Background and rationale**
+Reasons behind this change and why it's relevant now. "The why"
+
+**Description**
+A clear and concise description of what you want to happen, including all scenarios.
+
+**Acceptance criteria**
+A formalized list of conditions that ensure that the feature can be considered as finished. 
+
+**Additional context**
+Add any other context or screenshots about the feature request here.