[Fix] issue template not applied

[givvemee]

Closes #55

Description

• Issue template as .yml was not applied properly, guessing it happenend due to its invalid file name including Emoji that only accepts ASCII.
• Fixing it by renamed each files

ETC

Checklist (Merge should only be performed once all of the following conditions are checked.)

• I have completed the necessary tests and verified that the functionality works as intended.
• I have written the code according to the code style guide.
• I have confirmed that only the intended files and changes have been committed.
• I have discussed these changes with my team members in advance, and all team members are aware of this PR.