Add issue and discussion templates

.github/DISCUSSION_TEMPLATE/help.yml

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+title: "[Help] "
+body:
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Verify
+      options:
+        - label: I searched the existing discussions for help
+          required: true
+  - type: textarea
+    id: help
+    attributes:
+      label: How can we help you?
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |
+        :warning: Unfortunately, my time is limited and I can't offer reliable user support. I might answer if you catch me on a slow day, or hopefully someone else will.

.github/DISCUSSION_TEMPLATE/ideas.yml

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+body:
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Verify
+      options:
+        - label: I searched the existing discussions for similar ideas
+          required: true
+  - type: textarea
+    id: help
+    attributes:
+      label: Share your idea or feature request
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: File a bug report to help improve zk-nvim.
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for filing a bug report!
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: Check if applicable
+      description: |
+        :warning: At the moment, there are no official lua maintainer for this project. Your bug report might be ignored, no hard feelings.
+        :heart: But if you would like to contribute a fix yourself, **I'll be happy to review a pull request**.
+      options:
+        - label: I have searched the existing issues (**required**)
+          required: true
+        - label: I'm willing to help fix the problem and contribute a pull request
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Describe the bug
+      description: Also tell me, what did you expect to happen?
+      placeholder: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: bug-steps
+    attributes:
+      label: How to reproduce?
+      description: |
+        Step by step explanation to reproduce the issue.
+
+        If you can, drag and drop:
+        - a zipped sample notebook
+        - screenshots or a screencast showing the issue
+      placeholder: |
+        1. Add a note with the content "..."
+        2. Run `:ZKNew`
+        3. See error
+        ...
+    validations:
+      required: true
+  - type: textarea
+    id: zk-config
+    attributes:
+      label: zk configuration
+      description: |
+        Paste the minimal `zk` configuration file (`.zk/config.toml`) reproducing the issue.
+      render: toml
+    validations:
+      required: true
+  - type: textarea
+    id: vim-config
+    attributes:
+      label: Neovim configuration
+      description: |
+        Paste the minimal Neovim configuration file (`init.vim` or `init.lua`) reproducing the issue.
+      render: viml
+    validations:
+      required: true
+  - type: textarea
+    id: bug-environment
+    attributes:
+      label: Environment
+      description: |
+        Run the following shell commands and paste the result here:
+        ```
+        zk --version && echo "system: `uname -srmo`" && nvim --version
+        ```
+      placeholder: |
+        zk 0.13.0
+        system: Darwin 22.5.0 arm64
+        NVIM v0.9.0
+        Build type: Release
+        LuaJIT 2.1.0-beta3
+
+           system vimrc file: "$VIM/sysinit.vim"
+          fall-back for $VIM: "/opt/homebrew/Cellar/neovim/0.9.0/share/nvim"
+
+        Run :checkhealth for more info
+      render: bash

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea for this project.
+body:
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: If you have an idea, open a discussion
+      options:
+        - label: I will [create a new discussion](https://github.com/mickael-menu/zk-nvim/discussions/new?category=ideas) instead of an issue.
+

.github/ISSUE_TEMPLATE/support.yml

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+name: User support
+description: You need help?
+body:
+  - type: markdown
+    attributes:
+      value: |
+        :warning: Unfortunately, my time is limited and I can't offer reliable user support. I might answer if you catch me on a slow day, or hopefully someone else will.
+  - type: checkboxes
+    id: checks
+    attributes:
+      label: If you need help, open a discussion
+      options:
+        - label: I will [create a new discussion](https://github.com/mickael-menu/zk-nvim/discussions/new?category=help) instead of an issue.