Update issue templates

Start clarifying OpenCost vs. Kubecost issues more succintly

.github/ISSUE_TEMPLATE/opencost-bug-report.md

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+---
+name: OpenCost Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the OpenCost bug is. Please ensure this is an issue related to the OpenCost cost model, API, UI or specification. Public Kubecost bugs may be opened at https://github.com/kubecost/cost-analyzer-helm-chart/ 
+
+**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.
+
+**Which version of OpenCost are you using?**
+This may be the Kubecost release.
+
+**Additional context**
+Add any other context about the problem here. Kubernetes versions and which public clouds you are working with are especially important.

.github/ISSUE_TEMPLATE/opencost-feature-request.md

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+---
+name: OpenCost Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context, documentation links, or screenshots about the feature request here.