Update issue templates (#926)

* Update issue templates

* Apply suggestions from code review

Co-Authored-By: dxvladislavvolkov <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in devextreme-angular
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- *************************************************************************************************
+To reduce the time it takes to process issues, search opened and closed tickets in our support center (https://www.devexpress.com/Support/Center/Question/List/1) before you submit a new issue. The tickets can contain resolutions, workarounds, or information about fixes.
+
+You can also find information that can help you to resolve the issue in the following resources:
+
+    - https://github.com/DevExpress/devextreme-angular/blob/master/README.md
+    - https://js.devexpress.com/Documentation/Guide/Getting_Started/Widget_Basics_-_Angular/
+******************************************************************************************************* -->
+
+# Bug Report
+
+<!-- Please provide the following information -->
+
+**Package versions:**
+
+    devexteme version:
+    devextreme-angular version:
+
+**Steps to reproduce:**
+<!-- Provide a sample application that illustrates the bug if possible. You can use the following services: 
+    - GitHub
+    - StackBlitz (https://stackblitz.com/edit/angular-c2djgn)
+    - Plunker (http://next.plnkr.co/edit/XuAPDd?preview)
+-->
+
+**Current behavior:**
+<!-- Describe how the bug manifests. -->
+
+**Expected behavior:**
+<!-- Describe what you expect to happen. -->
+
+**Screenshots:**
+<!-- Add screenshots that demonstrate your problem if possible. -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature for devextreme-angular
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- *****************************************************************************************************
+Please look through our Roadmap for future releases (https://js.devexpress.com/Roadmap/) before you submit an issue.
+********************************************************************************************************** -->
+
+# Feature request
+
+**Package versions you currently use:**
+
+    devexteme version:
+    devextreme-angular version:
+
+**Description:**
+<!-- Describe a problem or missing capability. -->
+
+**Preferred Solution:**
+<!-- Describe the solution you would like to see. -->
+
+**Alternatives:**
+<!-- If you have considered any alternative solutions or workarounds, describe them. -->

.github/ISSUE_TEMPLATE/support-question.md

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+---
+name: Support Question
+about: Questions and requests for support.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Support Question
+
+Please do not submit support requests and "How to" questions here. Navigate to our Support Center (https://devexpress.com/sc) instead.