feat: added password toggle button for stakeholder

[trinetra110]

📋 Description

Added a password toggle button in the password field of signup and login page for stakeholder.

🔨 Changes Made

• Added the icon in "stk_signup.html" and "stk_login.html" while containing it in a div
• Added the toggle script and font-awesome CDN link in the same pages
• Added the appropriate styles in "login_style.css"
• Formatted the file structure

✅ Checklist

Before submitting the PR, please make sure you have completed the following:

• I have followed all the guidelines mentioned in CONTRIBUTING.md.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if applicable).
• I have tested it locally and it works fine.
• Any dependent changes have been merged and published in downstream modules.

🏷️ Types of Changes

What type of changes does your code introduce? (Check all that apply)

• Bug fix (non-breaking change which fixes an issue) 🐛

• New feature (non-breaking change which adds functionality) ✨

• UI enhancement (non-breaking change which enhances UI) 🎨

• Documentation update 📚

• Fixes Feat: Adding a password toggle btn for stakeholders #420

📸 Screenshots (if applicable)

Login Page

Signup Page

---

Thank you for contributing to Research Nexus! We look forward to reviewing your PR and getting it merged!

[trinetra110]

@Harshdev098 I have made the required changes. Please review it and add the 'gssoc-ext' and 'level2' tags.

[Harshdev098]

@trinetra110 The icons will trigger like this-

[trinetra110]

Oh, sorry I'll fix that.

[trinetra110]

@Harshdev098 Issue fixed for both the pages; please check.

[github-actions]

🎉🎉 Thank you for your contribution! Your PR #422 has been merged! 🎉🎉