Update issue templates (#1914)

.github/ISSUE_TEMPLATE/---bug-report.md

+---
+name: "\U0001F41B Bug Report"
+about: Create a report to help us improve torchvision
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 🐛 Bug
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1.
+1.
+1.
+
+<!-- If you have a code sample, error messages, stack traces, please provide it here as well -->
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Environment
+
+Please copy and paste the output from our
+[environment collection script](https://raw.githubusercontent.com/pytorch/pytorch/master/torch/utils/collect_env.py)
+(or fill out the checklist below manually).
+
+You can get the script and run it with:
+```
+wget https://raw.githubusercontent.com/pytorch/pytorch/master/torch/utils/collect_env.py
+# For security purposes, please check the contents of collect_env.py before running it.
+python collect_env.py
+```
+
+ - PyTorch / torchvision Version (e.g., 1.0 / 0.4.0):
+ - OS (e.g., Linux):
+ - How you installed PyTorch / torchvision (`conda`, `pip`, source):
+ - Build command you used (if compiling from source):
+ - Python version:
+ - CUDA/cuDNN version:
+ - GPU models and configuration:
+ - Any other relevant information:
+
+## Additional context
+
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/---documentation.md

+---
+name: "\U0001F4DA Documentation"
+about: Report an issue related to https://pytorch.org/docs
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 📚 Documentation
+
+<!-- A clear and concise description of what content in https://pytorch.org/docs is an issue. If this has to do with the general https://pytorch.org website, please file an issue at https://github.com/pytorch/pytorch.github.io/issues/new/choose instead. If this has to do with https://pytorch.org/tutorials, please file an issue at https://github.com/pytorch/tutorials/issues/new -->

.github/ISSUE_TEMPLATE/--feature-request.md

+---
+name: "\U0001F680Feature Request"
+about: Submit a proposal/request for a new torchvision feature
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 🚀 Feature
+<!-- A clear and concise description of the feature proposal -->
+
+## Motivation
+
+<!-- Please outline the motivation for the proposal. Is your feature request related to a problem? e.g., I'm always frustrated when [...]. If this is related to another GitHub issue, please link here too -->
+
+## Pitch
+
+<!-- A clear and concise description of what you want to happen. -->
+
+## Alternatives
+
+<!-- A clear and concise description of any alternative solutions or features you've considered, if any. -->
+
+## Additional context
+
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/-questions-help-support.md

+---
+name: "❓Questions/Help/Support"
+about: Do you need support? We have resources.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## ❓ Questions and Help
+
+### Please note that this issue tracker is not a help form and this issue will be closed.
+
+We have a set of [listed resources available on the website](https://pytorch.org/resources). Our primary means of support is our discussion forum:
+
+- [Discussion Forum](https://discuss.pytorch.org/)

.github/ISSUE_TEMPLATE/feature_request.md

+---
+name: Feature request
+about: Submit a proposal/request for a new torchvision feature
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 🚀 Feature
+<!-- A clear and concise description of the feature proposal -->
+
+## Motivation
+
+<!-- Please outline the motivation for the proposal. Is your feature request related to a problem? e.g., I'm always frustrated when [...]. If this is related to another GitHub issue, please link here too -->
+
+## Pitch
+
+<!-- A clear and concise description of what you want to happen. -->
+
+## Alternatives
+
+<!-- A clear and concise description of any alternative solutions or features you've considered, if any. -->
+
+## Additional context
+
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/issue-----documentation.md

+---
+name: "Issue: \U0001F4DA Documentation"
+about: Report an issue related to https://pytorch.org/docs
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## 📚 Documentation
+
+<!-- A clear and concise description of what content in https://pytorch.org/docs is an issue. If this has to do with the general https://pytorch.org website, please file an issue at https://github.com/pytorch/pytorch.github.io/issues/new/choose instead. If this has to do with https://pytorch.org/tutorials, please file an issue at https://github.com/pytorch/tutorials/issues/new -->

.github/ISSUE_TEMPLATE/issue---questions-help-support.md

+---
+name: 'Issue: ❓Questions/Help/Support'
+about: Do you need support? We have resources.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## ❓ Questions and Help
+
+### Please note that this issue tracker is not a help form and this issue will be closed.
+
+We have a set of [listed resources available on the website](https://pytorch.org/resources). Our primary means of support is our discussion forum:
+
+- [Discussion Forum](https://discuss.pytorch.org/)