Replace WYSIWYG editor with Markdown editor across all relevant models and admin fields. Add utilities for rendering and stripping markdown. Adjust serializers, views, and templates to support markdown content. Introduce `PastedImage` model and upload endpoint for handling inline image uploads in markdown.
This change simplifies content formatting while enhancing flexibility with markdown support.
Fixes: (1) Removed all `# type: ignore` annotations across the codebase; (2) Fixed usage of Django Model methods by eliminating unnecessary `# type: ignore` directives; (3) Adjusted usage of functions like `get()` to align with method expectations, removing incorrect comments;
Extra: (1) Deleted `pyrightconfig.json` as part of migration to a stricter type-checked environment; (2) Minor code cleanup, including formatting changes and refactoring import statements in adherence to PEP8 recommendations.
Fixes: 1) Add missing import for `AdminPasswordChangeForm`, `UserCreationForm`, and `MarkdownWidget`.
Extra: 1) Add `django-unfold-markdown` as a dependency in `uv.lock` and `pyproject.toml`; 2) Remove redundant dropdown configuration from Unfold settings.
Fixes: 1) Remove redundant imports from admin.py;
Extra: 1) Update inline classes to inherit from TabularInline; 2) Add unfold.contrib modules to INSTALLED_APPS; 3) Reorder imports in admin.py for consistency.
