github: Switch to yaml issue templates

These provide more flexibility and can be designed to extract more
information from users when submitting issues.

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: Submit a new bug report.
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ## This issue tracker is only for technical issues related to Bitcoin Core.
+
+        * General bitcoin questions and/or support requests should use Bitcoin StackExchange at https://bitcoin.stackexchange.com.
+        * For reporting security issues, please read instructions at https://bitcoincore.org/en/contact/.
+        * If the node is "stuck" during sync or giving "block checksum mismatch" errors, please ensure your hardware is stable by running `memtest` and observe CPU temperature with a load-test tool such as `linpack` before creating an issue.
+
+        ----
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+      - label: I have searched the existing issues
+        required: true
+  - type: textarea
+    id: current-behaviour
+    attributes:
+      label: Current behaviour
+      description: Tell us what went wrong
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected behaviour
+      description: Tell us what you expected to happen
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: Steps to reproduce
+      description: |
+        Tell us how to reproduce your bug. Please attach related screenshots if necessary.
+        * Run-time or compile-time configuration options
+        * Actions taken
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: |
+        Please copy and paste any relevant log output or attach a debug log file.
+
+        You can find the debug.log in your [data dir.](https://github.com/bitcoin/bitcoin/blob/master/doc/files.md#data-directory-location)
+
+        Please be aware that the debug log might contain personally identifying information.
+    validations:
+      required: false
+  - type: dropdown
+    attributes:
+      label: How did you obtain Bitcoin Core
+      multiple: false
+      options:
+        - Compiled from source
+        - Pre-built binaries
+        - Package manager
+        - Other
+    validations:
+      required: true
+  - type: input
+    id: core-version
+    attributes:
+      label: What version of Bitcoin Core are you using?
+      description: Run `bitcoind --version` or in Bitcoin-QT use `Help > About Bitcoin Core`
+      placeholder: e.g. v24.0.1 or master@e1bf547
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system and version
+      placeholder: e.g. "MacOS Ventura 13.2" or "Ubuntu 22.04 LTS"
+    validations:
+      required: true
+  - type: textarea
+    id: machine-specs
+    attributes:
+      label: Machine specifications
+      description: |
+        What are the specifications of the host machine?
+        e.g. OS/CPU and disk type, network connectivity
+    validations:
+      required: false
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Bitcoin Core Security Policy
+    url: https://github.com/bitcoin/bitcoin/blob/master/SECURITY.md
+    about: View security policy
+  - name: Bitcoin Core Developers
+    url: https://bitcoincore.org
+    about: Bitcoin Core homepage

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest an idea for this project.
+labels: [Feature]
+body:
+  - type: textarea
+    id: feature
+    attributes:
+      label: Please describe the feature you'd like to see added.
+      description: Attach screenshots or logs if applicable.
+    validations:
+      required: true
+  - type: textarea
+    id: related-problem
+    attributes:
+      label: Is your feature related to a problem, if so please describe it.
+      description: Attach screenshots or logs if applicable.
+    validations:
+      required: false
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+    validations:
+      required: false
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe any alternatives you've considered
+    validations:
+      required: false
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Please leave any additional context
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/good_first_issue.yml

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+name: Good First Issue
+description: (Regular devs only) Suggest a new good first issue
+labels: [good first issue]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please add the label "good first issue" manually before or after opening
+
+        A good first issue is an uncontroversial issue, that has a relatively unique and obvious solution
+
+        Motivate the issue and explain the solution briefly
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: Motivate the issue
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Possible solution
+      description: Describe a possible solution
+    validations:
+      required: false
+  - type: textarea
+    id: useful-skills
+    attributes:
+      label: Useful Skills
+      description: For example, “`std::thread`”, “Qt5 GUI and async GUI design” or “basic understanding of Bitcoin mining and the Bitcoin Core RPC interface”.
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: Guidance for new contributors
+      description: Please leave this to automatically add the footer for new contributors
+      value: |
+        Want to work on this issue?
+
+        For guidance on contributing, please read [CONTRIBUTING.md](https://github.com/bitcoin/bitcoin/blob/master/CONTRIBUTING.md) before opening your pull request.
+

.github/ISSUE_TEMPLATE/gui_issue.yml

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+name: Issue or feature request related to the GUI
+description: Any report, issue or feature request related to the GUI
+labels: [GUI]
+body:
+- type: checkboxes
+  id: acknowledgement
+  attributes:
+    label: Issues, reports or feature requests related to the GUI should be opened directly on the GUI repo
+    description: https://github.com/bitcoin-core/gui/issues/
+    options:
+      - label: I still think this issue should be opened here
+        required: true
+- type: textarea
+  id: gui-request
+  attributes:
+    label: Report
+  validations:
+    required: true