ci/docs: ShellCheck workflow, GitHub rulesets script, and Discussions templates

.github/DISCUSSION_TEMPLATE/WELCOME_POST.md

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+# 👋 Welcome to the Minecraft Splitscreen Steam Deck community!
+
+This is the place to connect with other players running splitscreen Minecraft on Steam Deck and Linux. Whether you're getting set up for the first time or a seasoned couch co-op veteran, you're in the right place.
+
+## 🗂️ How this space is organised
+
+| Category | Use it for |
+|----------|-----------|
+| 📣 **Announcements** | Release notes and project updates (maintainers only) |
+| 🙏 **Help & Support** | Installation problems, controller issues, mod errors |
+| 💡 **Ideas** | Feature requests and suggestions |
+| 🎮 **Show & Tell** | Share your setup, screenshots, and tips |
+| 💬 **General** | Anything else — intros, off-topic chat |
+
+## 🚀 Quick links
+
+- **Installer** — run in a terminal on your Steam Deck:
+  ```bash
+  curl -fsSL https://raw.githubusercontent.com/aradanmn/MinecraftSplitscreenSteamdeck/main/install-minecraft-splitscreen.sh | bash
+  ```
+- **README** — full setup guide and FAQ
+- **Issues** — confirmed bugs only (use Help & Support for questions first)
+
+## 🎮 Introduce yourself!
+
+Drop a comment below — tell us what brought you here, how many controllers you're running, and what you're playing. We'd love to hear from you!

.github/DISCUSSION_TEMPLATE/help-and-support.yml

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+title: "[Help] "
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reaching out! To help you faster, please fill in as much detail as possible.
+
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      options:
+        - Steam Deck (SteamOS / Game Mode)
+        - Steam Deck (Desktop Mode)
+        - Bazzite
+        - Other Linux (please describe below)
+    validations:
+      required: true
+
+  - type: dropdown
+    id: launcher_type
+    attributes:
+      label: PrismLauncher install type
+      options:
+        - Flatpak
+        - AppImage
+        - Not sure
+    validations:
+      required: true
+
+  - type: input
+    id: minecraft_version
+    attributes:
+      label: Minecraft version
+      placeholder: "e.g. 1.21.4"
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: What's happening?
+      description: Describe the problem clearly. What did you expect vs. what actually happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. Run installer via curl …
+        2. Select mods …
+        3. Launch splitscreen …
+        4. Error occurs at …
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Installer or launcher logs
+      description: |
+        Paste relevant log output here. Logs are saved to:
+        `~/.local/share/MinecraftSplitscreen/logs/`
+      render: shell

.github/DISCUSSION_TEMPLATE/ideas.yml

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+title: "[Idea] "
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Got an idea to make Minecraft splitscreen better? Share it here!
+        Check existing discussions first to avoid duplicates.
+
+  - type: textarea
+    id: summary
+    attributes:
+      label: What's the idea?
+      description: One or two sentences summarising the feature or improvement.
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does it solve?
+      description: What friction or limitation does this address today?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: How would this work from the user's perspective?
+
+  - type: dropdown
+    id: scope
+    attributes:
+      label: Which part of the project does this affect?
+      multiple: true
+      options:
+        - Installer script
+        - Launcher script (splitscreen.sh)
+        - Dynamic splitscreen mode
+        - Mod selection / compatibility
+        - Steam integration
+        - Desktop shortcuts
+        - Controller detection
+        - Documentation

.github/DISCUSSION_TEMPLATE/show-and-tell.yml

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+title: "[Show & Tell] "
+labels: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Share your splitscreen Minecraft setup! Screenshots, videos, mod combos,
+        custom configs — all welcome. Inspire the community 🎮
+
+  - type: textarea
+    id: setup
+    attributes:
+      label: Your setup
+      description: Describe your hardware, player count, mods, and anything that makes it great.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: players
+    attributes:
+      label: Player count
+      options:
+        - "1 (solo / testing)"
+        - "2"
+        - "3"
+        - "4"
+    validations:
+      required: true
+
+  - type: textarea
+    id: tips
+    attributes:
+      label: Tips for others
+      description: Anything you learned the hard way that others should know?
+
+  - type: input
+    id: media
+    attributes:
+      label: Screenshot / video link
+      placeholder: "Optional — paste an image URL or link to a clip"