[Update] Update GitHub repo templates

.github/ISSUE_TEMPLATE/feature_request.yml

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+---
+name: Feature request
+title: "[Feature Request] your title goes here"
+description: "for when you want to see something new added to the CSSU website"
+labels: "enhancement"
+assignees: JasonBarahan
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: "Describe your feature. How does it work?"
+      placeholder: "This feature allows me to mine cryptocurrency using your servers!"
+    validations:
+      required: true
+  - type: textarea
+    id: rationale
+    attributes:
+      label: Rationale
+      description: "Describe why you think we should add this feature."
+      placeholder: "We should add this feature because mining crypto makes me richer."
+    validations:
+      required: true
+  - type: textarea
+    id: implementation
+    attributes:
+      label: Implementation
+      description: "OPTIONAL. This is if you'd like to see a feature implemented in a specific way."
+      placeholder: "We can implement this feature by downloading and running this cool executable file."
+    validations:
+      required: false
+---

.github/ISSUE_TEMPLATE/site-issue.yml

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+---
+name: Site issue
+description: "for when you see something on the site that isn't working"
+title: "[Site issue] your title goes here"
+labels: 'bug'
+assignees: JasonBarahan
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: "Describe your issue here. What were you trying to do? What happened instead? Please also include a link to the page if applicable."
+      placeholder: "I was trying to see what upcoming events there are, but the site is too slow!"
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction_steps
+    attributes:
+      label: Reproduction steps
+      description: "How did you encounter the bug? State the device you are using, the browser you are using, and what you did that triggered the bug."
+      placeholder: "I was using Safari on my iPhone 14, clicked on the Events section on the site, and it took 14 seconds to load all the content"
+    validations:
+      required: true
+  - type: textarea
+    id: details
+    attributes:
+      label: additional_details
+      description: "OPTIONAL. Add any more details you wish to share."
+      placeholder: "I was on the subway when I tried doing this... that shouldn't affect anything, right?"
+    validations:
+      required: false
+---

.github/ISSUE_TEMPLATE/update.yml

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+---
+name: Site issue
+description: "for when content on the site needs to be added or updated"
+title: "[Update] your title goes here"
+assignees: JasonBarahan
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: "Describe the content that needs to be added or updated in detail. Feel free to be really specific."
+      placeholder: "Example: The CSSU will be holding their annual semi-formal on March 22 at Old Victoria. [add more details]"
+    validations:
+      required: true
+---