refactor(templates): simplify issue and PR templates

[Readpato]

Description

Summary

• Simplify issue templates for : "Bug Report" and "Feature Request"
• Modify "Pull Request" Template

Changes

What kind of change does this PR introduce? (check at least one by adding an "x" between the brackets)

• [ ] Bugfix
• [] Feature
• [ ] Code style update
• [X] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [X] No

The PR fulfills these requirements:

• [X] Schrödinger Hat code of conduct

Other information:

• Make creating issues and PR easier

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[Readpato]

@Wabri Good idea 👍 I'm going to also add it to the nuxt template. Imma create some issues =]