docs: add issue templates (#195)

* docs: add issue templates

* refactor: mention show and tell

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+description: Report your bugs with the theme here!
+labels: [bug]
+body:
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue outlining your problem?
+      description: Please search to see if an issue already exists for your problem.
+      options:
+        - label: I have searched the existing issues and they do not solve my problem.
+          required: true
+  - type: textarea
+    attributes:
+      label: Describe your problem.
+      description: Also tell us, what do you expect to see?
+      placeholder: The battery charging icon is missing...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Paste your configuration.
+      description: Provide us with the contents of your `.tmux.conf` file.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Attach screenshots.
+      description: If applicable, attach screenshots which clearly highlight the issue.
+  - type: input
+    attributes:
+      label: What tmux version are you seeing the issue on?
+      description: "You can find your version by running `tmux -V`"
+      placeholder: tmux 3.3a
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Any additional comments?
+      description: Add any information that hasn't been covered in the previous sections!

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask A Question
+    url: https://github.com/catppuccin/tmux/discussions/new?category=q-a
+    about: Need help tweaking your Catppuccin tmux configuration? Ask questions in GitHub Discussions!
+  - name: Show & Tell
+    url: https://github.com/catppuccin/tmux/discussions/new?category=show-and-tell
+    about: Want to showcase your customised Catppuccin tmux configuration? Show it off in GitHub Discussions!
+  - name: Community Discord
+    url: https://discord.com/servers/catppuccin-907385605422448742
+    about: Chat to other community members!

.github/ISSUE_TEMPLATE/enhancement.yml

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+name: Enhancement Issue
+description: Request improvements to the theme here!
+labels: [enhancement]
+body:
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue outlining your improvement?
+      description: Please search to see if your improvement has already been raised as an issue.
+      options:
+        - label: I have searched the existing issues and my improvement has not been raised yet.
+          required: true
+  - type: textarea
+    attributes:
+      label: What would you like to see added and/or changed?
+      description: Make sure to mention why you think this is an improvement!
+      placeholder: I'd like to have an extra configuration option for...
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/meta.yml

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+name: Meta Issue
+description: Raise any issue regarding the repository here!
+labels: [meta]
+body:
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue outlining your problem?
+      description: Please search to see if an issue already exists for your problem.
+      options:
+        - label: I have searched the existing issues and they do not solve my problem.
+          required: true
+  - type: textarea
+    attributes:
+      label: Describe your issue.
+      description: Bugs should be raised under a [Bug Report](https://github.com/catppuccin/tmux/issues/new?assignees=&labels=bug&template=bug.yml).
+      placeholder: The README is missing crucial information such as...
+    validations:
+      required: true