docs: improve issue templates and add PR form

[PravinKamble123]

This PR introduces improvements to the existing issue templates and adds a dedicated pull request (PR) form to streamline the contribution workflow. It ensures clarity, consistency, and professionalism across all user submissions.

Key Improvements:

✅ Enhanced bug report and feature request templates with better structure, validations, and contextual help.

➕ Introduced a PR form template to guide contributors when opening pull requests.

🏷️ Encourages better labeling and checklists to reduce review time and improve clarity.

These changes aim to make contributing to BabelDOC more intuitive and efficient, particularly as the community grows.

[awwaawwa]

https://funstory-ai.github.io/BabelDOC/CONTRIBUTING/

It may be necessary to specify in the checkbox of the PR:

Due to the current high rate of code changes, this project only accepts small PRs. If you would like to suggest a change and you include a patch as a proof-of-concept, that would be great. However, please do not be offended if we rewrite your patch from scratch.

However, I've been thinking about changing this sentence to:

Due to limited maintainer resources, this project only accepts small pull requests. Suggestions for changes accompanied by a proof-of-concept patch are highly appreciated. However, please understand that your patch may be rewritten from scratch if necessary.

In the PR template, you can directly use the one below, I'll modify the docs later.

[PravinKamble123]

@awwaawwa thanks for taking the time to review and share you feedback.
Updated the PR template to include the contribution policy note as suggested. Let me know if anything else is needed! 🙌

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

.github/PULL_REQUEST_TEMPLATE/pr_form.yml:2

• [nitpick] The project name 'babelDoc' is inconsistently capitalized; consider changing it to 'BabelDOC' to align with other templates.

description: Submit a pull request to contribute to babelDoc

.github/PULL_REQUEST_TEMPLATE/pr_form.yml:10

• [nitpick] Inconsistent naming detected; update 'babelDoc' to 'BabelDOC' for consistency across the project.

## 👋 Thanks for contributing to **babelDoc**!

[awwaawwa]

Please correct the capitalization of BabelDOC.

[PravinKamble123]

Please correct the capitalization of BabelDOC.

Updated .

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

[awwaawwa]

Thank you for your contribution. According to https://funstory-ai.github.io/BabelDOC/CONTRIBUTOR_REWARD/ , you can apply for a monthly membership redemption code for Immersive Translate.