Issues and PR templates (#1135)

Issues and PRs descriptions sometimes lacks of details we would like to have to better understand the motivations behind.

I propose here templates to guide the reporters towards good descriptions.

These templates are heavily inspired from the ones of the PeerTube project.

Fixes #1125

---------

Co-authored-by: CamilleLegeron <camille@telescoop.fr>

.github/ISSUE_TEMPLATE/00-bug-issue.yml

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+# Inspired by PeerTube templates:
+# https://github.com/Chocobozzz/PeerTube/blob/3d4d49a23eae71f3ce62cbbd7d93f07336a106b7/.github/ISSUE_TEMPLATE/00-bug-issue.yml
+name: 🐛 Bug Report
+description: Use this template for reporting a bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking time to fill out this bug report!
+        Please search among past open/closed issues for a similar one beforehand:
+          - https://github.com/gristlabs/grist-core/issues?q=
+          - https://community.getgrist.com/
+
+  - type: textarea
+    attributes:
+      label: Describe the current behavior
+
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      value: |
+          1.
+          2.
+          3.
+
+  - type: textarea
+    attributes:
+      label: Describe the expected behavior
+
+  - type: checkboxes
+    attributes:
+      label: Where have you encountered this bug?
+      options:
+        - label: On [docs.getgrist.com](https://docs.getgrist.com)
+        - label: On a self-hosted instance 
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Instance information (when self-hosting only)
+      description: In case you self-host, please share information above. You can discard any question you don't know the answer.
+      value: |
+          * Grist instance:
+            * Version:
+            * URL (if it's OK for you to share it):
+            * Installation mode: docker/kubernetes/...
+            * Architecture: single-worker/multi-workers
+
+          * Browser name, version and platforms on which you could reproduce the bug:
+          * Link to browser console log if relevant:
+          * Link to server log if relevant:

.github/ISSUE_TEMPLATE/10-installation-issue.yml

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+# Inspired by PeerTube templates:
+# https://github.com/Chocobozzz/PeerTube/blob/master/.github/ISSUE_TEMPLATE/10-installation-issue.yml
+name: 🛠️ Installation/Upgrade Issue
+description: Use this template for installation/upgrade issues
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please check first the official documentation for self-hosting: https://support.getgrist.com/self-managed/
+
+  - type: markdown
+    attributes:
+      value: |
+        Please search among past open/closed issues for a similar one beforehand:
+          - https://github.com/gristlabs/grist-core/issues?q=
+          - https://community.getgrist.com/
+
+  - type: textarea
+    attributes:
+      label: Describe the problem
+
+  - type: textarea
+    attributes:
+      label: Additional information
+      value: |
+          * Grist version:
+          * Grist instance URL:
+          * SSO solution used and its version (if relevant):
+          * S3 storage solution and its version (if relevant):
+          * Docker version (if relevant):
+          * NodeJS version (if relevant):
+          * Redis version (if relevant):
+          * PostgreSQL version (if relevant):

.github/ISSUE_TEMPLATE/20-feature-request.yml

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+# Inspired by PeerTube templates:
+# https://github.com/Chocobozzz/PeerTube/blob/master/.github/ISSUE_TEMPLATE/30-feature-request.yml
+---
+name: ✨ Feature Request
+description: Use this template to ask for new features and suggest new ideas 💡
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking time to share your ideas!
+        Please search among past open/closed issues for a similar one beforehand:
+          - https://github.com/gristlabs/grist-core/issues?q=
+          - https://community.getgrist.com/
+
+  - type: textarea
+    attributes:
+      label: Describe the problem to be solved
+      description: Provide a clear and concise description of what the problem is
+
+  - type: textarea
+    attributes:
+      label: Describe the solution you would like
+      description: Provide a clear and concise description of what you want to happen

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🤷💻🤦 Question/Forum
+    url: https://community.getgrist.com/
+    about: You can ask and answer other questions here
+  - name: 💬 Discord
+    url: https://discord.com/invite/MYKpYQ3fbP
+    about: Chat with us via Discord for quick Q/A here and sharing tips

.github/PULL_REQUEST_TEMPLATE.md

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+## Context
+
+<!-- Please include a summary of the change, with motivation and context -->
+<!-- Bonus: if you are comfortable writing one, please insert a user-story https://en.wikipedia.org/wiki/User_story#Common_templates -->
+
+## Proposed solution
+
+<!-- Describe here how you address the issue -->
+
+## Related issues
+
+<!-- If suggesting a new feature or change, please discuss it in an issue first -->
+<!-- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!-- If this does not solve entirely the issue, make also a checklist of what is done or not: -->
+
+## Has this been tested?
+
+<!-- Put an `x` in the box that applies: -->
+
+- [ ] 👍 yes, I added tests to the test suite
+- [ ] 💭 no, because this PR is a draft and still needs work
+- [ ] 🙅 no, because this is not relevant here
+- [ ] 🙋 no, because I need help <!-- Detail how we can help you -->
+
+## Screenshots / Screencasts
+
+<!-- delete if not relevant -->