Improve issue templates (#1398)

* Update issue templates, thanks @explosion for the inspiration.

Direct support questions to StackOverflow instead.

* Remove stale issue templates.

* Update ---bug-report.md

* Update ---documentation.md

.github/ISSUE_TEMPLATE/1_Bug_report.md → .github/ISSUE_TEMPLATE/---bug-report.md

 ---
 ---
-name: Bug report
-about: Report errors and problems
+name: "\U0001F41E Bug Report"
+about: Did you find a bug?
+title: ''
+labels: 'Bug'
+assignees: ''
 
 
 ---
 ---
 
 

.github/ISSUE_TEMPLATE/4_Documentation_issue.md → .github/ISSUE_TEMPLATE/---documentation.md

 ---
 ---
-name: Documentation issue
-about: Report errors and problems with the documentation (https://poetry.eustace.io/docs/)
+name: "\U0001F4DA Documentation"
+about: Did you find errors, problems, or anything unintelligible in the docs?
+title: 'https://poetry.eustace.io/docs'
+labels: 'Documentation'
+assignees: ''
 
 
 ---
 ---
 
 

.github/ISSUE_TEMPLATE/---everything-else.md

+---
+name: "\U0001F5C3 Everything Else"
+about: For questions and issues that do not fall in any of the other categories. This
+  can include questions about Poetry's roadmap. For support questions, please post
+  on StackOverflow.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Describe your question and issue here. This space is meant to be used for general questions that are neither bugs, feature requests, nor documentation issues. A good example would be a question regarding Poetry's roadmap, for example. If you're looking for help when it comes to using Poetry, consider posting a question on StackOverflow instead: http://stackoverflow.com/questions/tagged/python-poetry -->
+
+
+<!-- Checked checkbox should look like this: [x] -->
+- [ ] I have searched the [issues](https://github.com/sdispater/poetry/issues) of this repo and believe that this is not a duplicate.
+- [ ] I have searched the [documentation](https://poetry.eustace.io/docs/) and believe that my question is not covered.

.github/ISSUE_TEMPLATE/2_Feature_request.md → .github/ISSUE_TEMPLATE/---feature-request.md

 ---
 ---
-name: Feature request
-about: Ideas for new features and improvements
+name: "\U0001F381 Feature Request"
+about: Do you have ideas for new features and improvements?
+title: ''
+labels: ''
+assignees: ''
 
 
 ---
 ---
 
 

.github/ISSUE_TEMPLATE/3_Support_question.md

----
-name: Support question
-about: Questions about Poetry that are not covered in the documentation (https://poetry.eustace.io/docs/)
-
----
-
-<!--
-  Hi there! Thank you for wanting to make Poetry better.
-
-  Before you submit this; let's make sure of a few things.
-  Please make sure the following boxes are ticked if they are correct.
-  If not, please try and fulfill these first.
--->
-
-<!-- Checked checkbox should look like this: [x] -->
-- [ ] I have searched the [issues](https://github.com/sdispater/poetry/issues) of this repo and believe that this is not a duplicate.
-- [ ] I have searched the [documentation](https://poetry.eustace.io/docs/) and believe that my question is not covered.
-
-## Question
-<!-- Now feel free to write your question. Thanks again 🙌 ❤️ -->