Delete custom.md

.github/ISSUE_TEMPLATE/custom.md

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----
-name: Custom issue template
-about: Describe this issue template's purpose here.
-title: "[Question] "
-labels: ''
-assignees: ''
-
----
-
-- [] Looked at the documentation first
-
-**Describe the question**
-
-**Version (please complete the following information):**
- - Version [e.g. 3.3.5]
- - PHP [e.g. 7.3]
-
-**Additional context**
-Add any other context about the problem here.