Fix Crispy Forms template errors and update README

[ibirothe]

This PR addresses the following issues:

1. Crispy Forms Bootstrap 4 template error

   • Added crispy-bootstrap4 to requirements.txt and INSTALLED_APPS.
   • Updated CRISPY_TEMPLATE_PACK to "bootstrap4" in settings.py.
   • Replaced legacy references to uni_form.html with the modern {{ form|crispy }} syntax.
   • This resolves the TemplateDoesNotExist: bootstrap4/uni_form.html error on login and register pages.

2. Template fixes

   • Corrected typos in form templates (e.g., titlte → title).
   • Fixed button HTML syntax and removed invalid commas.

3. README update

   • Clarified package installation instructions.
   • Updated instructions to reflect the new Crispy Forms setup.
   • Improved formatting and readability.

✅ With these changes, the project now runs without template errors, and new developers have accurate setup instructions.