Update ISSUE_TEMPLATE to new format

[sebastiaanspeck]

https://github.com/tldr-pages/tldr-node-client/blob/7d074cfaac19abc8cd10dde822a2fed3ef92d594/.github/ISSUE_TEMPLATE.md is still using the old format:

An example of the new format: https://github.com/tldr-pages/tldr/tree/main/.github/ISSUE_TEMPLATE