docs: remove temporary Hacktoberfest issue templates (#4982)

Co-authored-by: Tania Chakraborty <tchakraborty@block.xyz>

.github/ISSUE_TEMPLATE/hacktobefest-content-submission.yml

@@ -1,29 +0,0 @@
-name: Hacktobefest Content
-title: "Hacktoberfest Blog: <add your title here>"
-labels: ["hacktoberfest", "hacktoberfest-accepted"]
-assignees: ["ebonylouis", "blackgirlbytes", "taniandjerry"]
-body:
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-
-  - type: input
-    id: url
-    attributes:
-      label: URL
-
-  - type: dropdown
-    id: kind
-    attributes:
-      label: Type
-      options:
-        - Blog post
-        - YouTube video
-
-  - type: checkboxes
-    id: public
-    attributes:
-      label: Confirmation
-      options:
-        - label: My submission is publicly accessible right now.

.github/ISSUE_TEMPLATE/hacktoberfest-content-submission.yml

@@ -1,30 +0,0 @@
-name: Hacktoberfest Content
-description: Issue template for various blog and video contributions as part of Hacktoberfest 2025
-title: "Hacktoberfest Blog: <add your title here>"
-labels: ["hacktoberfest", "hacktoberfest-accepted"]
-assignees: ["ebonylouis", "blackgirlbytes", "taniandjerry"]
-body:
-  - type: textarea
-    id: description
-    attributes:
-      label: Description
-
-  - type: input
-    id: url
-    attributes:
-      label: URL
-
-  - type: dropdown
-    id: kind
-    attributes:
-      label: Type
-      options:
-        - Blog post
-        - YouTube video
-
-  - type: checkboxes
-    id: public
-    attributes:
-      label: Confirmation
-      options:
-        - label: My submission is publicly accessible right now.