[jinja/en] Create page about Jinja (#4852)

* feat(jinja): Add Jinja template introduction and examples
- Added a detailed introduction to Jinja templating engine for Python
- Included examples for variables, template inheritance, including content and loops
- Provided explanations and syntax for delimiters, template inheritance,
  variables, loops, conditionals, and including content
- Demonstrated how to use Jinja for web development, such as creating HTML
  templates and including dynamic content displayed within a browser

* [jinja/en] Create Jinja documentation

- Improved the readability and consistency of the content in the file by
  adjusting the line breaks and formatting of the text.
- Corrected the whitespace and formatting issues in the code snippets.
- Unified the style of the text by keeping similar instructions on the same
  text alignment level for easier comprehension.
- Ensured proper spacing and indentation in the 'Template Inheritance' section
  for a better display and understanding of the concept.
- Updated the 'Including Content' section to fix a typo in the include tag.
- Streamlined the 'Variables passed to the main template' section by refining
  the explanation and enhancing clarity.
- Consolidated information in the 'Conditionals, Macros, and Official
  Documentation' sections to provide a clearer and consistent documentation
  style.
- Incorporated a link to the official Jinja documentation for further
  reference.

* chore: Organize Jinja's template inheritance section

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