gh: add github stuff

.github/CONTRIBUTING.md

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+# Contributing
+
+There are only a few rules:
+- Follow the commit convention as follows:
+  - The name of the commit should be `module: change`
+  - Try to be consistent with the module names; you can look at existing commits for the module names I use
+  - If there is more than one change, the change in the commit name should be the most impactful change
+  - Put other changes in the description
+- Format your code
+  - I use the vscode qml extension with default arguments to format the code, however you do not have to use it
+  - Just try to follow the code style of the rest of the code and ensure that there is:
+    - no trailing whitespace on any lines
+    - a single space between operators
+- No AI slop allowed
+  - AI readme/docs slop = instant block
+- PLEASE TEST YOUR PRS
+  - I can't believe I have to put this here, but please test your PRs before submitting them
+  - Your PR must not break anything currently existing, or specify in the description if it does
+- PR descriptions should be descriptive
+  - Please explain what the PR does and how to use it in your PR description
+  - Also include any breaking changes and/or side effects of the PR

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: soramanew
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: soramane
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
+polar: # Replace with a single Polar username
+buy_me_a_coffee: soramane
+thanks_dev: # Replace with a single thanks.dev username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature request
+description: Suggest a new feature
+labels: ["enhancement"]
+type: "Feature"
+title: "[FEATURE] "
+body:
+    - type: markdown
+      attributes:
+          value: "NOTE: Please write in **English**."
+
+    - type: textarea
+      attributes:
+          label: "What would you like to be added?"
+          description: "Can be a suggestion for an existing feature. You can suggest a widget, minor user interaction changes.. whatever."
+
+    - type: textarea
+      attributes:
+          label: "How will it help?"
+          description: "It's helpful to include examples (like in your use case)."
+
+    - type: textarea
+      attributes:
+          label: "Extra info"
+          description: "If you want a new widget, a pic of the inspiration (if available) would be awesome."

.github/ISSUE_TEMPLATE/issue.yml

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+name: Issue
+description: Report an issue with the dots
+labels: ["bug"]
+type: "Bug"
+title: "[BUG] "
+body:
+    - type: markdown
+      attributes:
+          value: "**Welcome to submit a new issue!**\n- It takes only 3 steps, so please be patient :)\n- Tip: If your issue is not a feature request and is not an issue with the dots (e.g. \"how do I use X feature\"), please use [Discussions](https://github.com/caelestia-dots/shell/discussions) instead."
+    - type: checkboxes
+      attributes:
+          label: "Step 1. Before you submit"
+          description: "Hint: The 2nd and 3rd checkbox is **not** forcely required as you may have failed to do so."
+          options:
+              - label: I have read the above instructions and am sure that this is supposed to be posted here.
+                required: true
+              - label: I've successfully updated to the latest versions following the [updating guide](https://github.com/caelestia-dots/caelestia?tab=readme-ov-file#updating).
+                required: false # Not required cuz user may have failed to do so
+              - label: I've successfully updated the system packages to the latest.
+                required: false # Not required cuz user may have failed to do so
+              - label: I've ticked the checkboxes without reading their contents
+                required: false # Obviously
+
+    - type: textarea
+      attributes:
+          label: "Step 2. Version info"
+          description: "Run `caelestia -v` and paste the result below."
+          value: "<details><summary>Version info</summary>\n\n```\n<!-- Run `caelestia -v` and paste the result here! -->\n```\n\n</details>"
+      validations:
+          required: true
+
+    - type: markdown
+      attributes:
+          value: |
+              **Tips for the following Step 3**
+              1. Use `LANG=C LC_ALL=C` to get the output of a command in English, eg. `LANG=C LC_ALL=C date` displays time in English.
+              2. If it throws errors, **PLEASE**, attach logs and describe in detail if possible.
+                 - Something happened to the shell (bar, dashboard, etc)? Run `caelestia shell -l` WITHOUT exiting the shell for logs.
+                 - Installation failed? Run installation again for logs.
+                 - You may use more code blocks when needed.
+              3. In case you are confused, the `<details>`, `<summary>`, `</summary>`, `</details>` are HTML tags for folding the logs (typically very long) inside. Please do not touch them (unless you know what you are doing).
+              4. If the logs are suuuuuuper long, consider using an online pastebin service instead.
+
+    - type: textarea
+      attributes:
+          label: "Step 3. Describe the issue"
+          value: "\n<!-- Firsly describe your issue here! -->\n\n<details><summary>Logs</summary>\n\n```\n<!-- Put your log content here!-->\n```\n\n</details>"
+      validations:
+          required: true
+
+    - type: checkboxes
+      attributes:
+          label: Reminder
+          options:
+              - label: I agree that it's usually impossible for others to help me without my logs.
+                required: true