docs: update md files

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Tell us about a bug you may have identified in CoreUI Free Vue Admin Template.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Before opening:
+
+- [Search for duplicate or closed issues](https://github.com/coreui/coreui-free-vue-admin-template/issues?utf8=%E2%9C%93&q=is%3Aissue)
+- [Validate](https://html5.validator.nu/) any HTML to avoid common problems
+- Read the [contributing guidelines](https://github.com/coreui/coreui-free-vue-admin-template/blob/v4-dev/.github/CONTRIBUTING.md)
+
+Bug reports must include:
+
+- Operating system and version (Windows, macOS, Android, iOS)
+- Browser and version (Chrome, Firefox, Safari, Microsoft Edge, Opera, Android Browser)
+- A [reduced test case](https://css-tricks.com/reduced-test-cases/) or suggested fix using [CodePen](https://codepen.io/) or [JS Bin](https://jsbin.com/)

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for a new feature in CoreUI Free Vue Admin Template.
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+Before opening:
+
+- [Search for duplicate or closed issues](https://github.com/coreui/coreui-free-vue-admin-template/issues?utf8=%E2%9C%93&q=is%3Aissue)
+- Read the [contributing guidelines](https://github.com/coreui/coreui-free-vue-admin-template/blob/main/.github/CONTRIBUTING.md)
+
+Feature requests must include:
+
+- As much detail as possible for what we should add and why it's important to Bootstrap
+- Relevant links to prior art, screenshots, or live demos whenever possible