Update CI and add doc & question issue template

.github/ISSUE_TEMPLATE/documentation.md

@@ -0,0 +1,9 @@
+---
+name: "\U0001F4D6 Documentation"
+about: Report an issue related to documentation
+
+---
+
+## 📖 Documentation
+
+<!-- Please specify whether it's tutorial part or API reference part, and describe it.-->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -1,6 +1,7 @@
 ---
 name: "\U0001F31FFeature Request"
 about: Request for a new Qlib feature
+labels: enhancement
 
 ---
 

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,10 @@
+---
+name: "❓Questions & Help"
+about: Have some questions? We can offer help.
+labels: question
+
+---
+
+## ❓ Questions and Help
+
+We sincerely suggest you to carefully read the [documentation](http://qlib.readthedocs.io/) of our library as well as the official [paper](https://arxiv.org/abs/2009.11189). After that, if you still feel puzzled, please describe the question clearly under this issue.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,21 @@
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Are there any related issues? If so, please put the link here. -->
+<!--- Why is this change required? What problem does it solve? -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, tests ran to see how -->
+<!--- your change affects other areas of the code, etc. -->
+
+## Screenshots (if appropriate):
+
+## Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Fix bugs
+- [ ] Add new feature
+- [ ] Update documentation

.github/workflows/test.yml

@@ -33,7 +33,7 @@ jobs:
     - name: Install test dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest pep8
+        pip install flake8 pytest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 
     - name: Lint with flake8
@@ -43,19 +43,9 @@ jobs:
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
 
-    - name: Check PEP8 python code style
-      run: |
-        find . -name \*.py -exec pep8 {} +
-
-
     - name: Test with pytest
       run: |
         pytest ../qlib
-    
-    - name: Test documents
-      run: |
-        pip install sphinx sphinx_rtd_theme
-        make html
 
     - name: Test data downloads and examples
       run: |