Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

+---
+name: Bug Report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Bug Description**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Type in '....'
+3. 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.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. CentOS 7.0]
+ - Memory, CPU, current Disk Space
+ - TDengine Version [e.g. 1.6.1.7]
+
+**Additional Context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/performance-related-questions.md

----
-name: Performance-related questions
-about: Any questions related to TDengine's performance
-title: ''
-labels: ''
-assignees: ''
-
----
-
-**General Questions**
-A general question should be related to TDengine's user's manual, user experience, milestones, business cooperations etc. 
-Before you ask a question, please:
-1. Try searching for answers in the official documentation
-2. Try searching in the existing issues on GitHub
-3. Try searching on tech forums such as Stack Overflow, Quora, CSDN, v2ex etc.
-4. Try using online searching engines such as Google, Bing, Baidu
-
-If all the ways above couldn't help, please clearly and concisely describe what the question is.