readme: add some useful notes

README.md

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+# Matematyka
+
+Przed Państwem kod źródłowy mojej strony z notatkami z matematyki.
+Zapraszam do oglądania i komentowania!
+
+## Thing about PDF customization
+
+<details><summary>Start here later</summary>
+
+
+ChatGPT
+To customize the title page generated by Sphinx when creating a PDF via make latexpdf, you can modify the LaTeX template used for the title page. Sphinx allows you to override the default LaTeX templates by providing your own custom template.
+
+Follow these steps to customize the title page:
+
+Step 1: Locate Sphinx's LaTeX Template Files
+Find the sphinx directory in your Python installation. You can usually locate it within the site-packages directory of your Python environment.
+
+Inside the sphinx directory, navigate to texinputs.
+
+Step 2: Copy Default Template
+Locate the sphinxmanual.cls or sphinxhowto.cls file (depending on the type of document you're generating).
+
+Copy this file to your Sphinx documentation project directory. Name the copied file something like custom_sphinxmanual.cls to avoid confusion.
+
+Step 3: Modify the Title Page in the Copied Template
+Open the copied file (custom_sphinxmanual.cls) in a text editor and find the section related to the title page. It might look something like this:
+
+latex
+Copy code
+\renewcommand{\maketitle}{
+  % Title page contents...
+}
+Modify the contents within the \maketitle command to customize the title page. You can change the layout, add or remove elements, or alter formatting as needed.
+
+Step 4: Use the Custom Template
+In your conf.py file in the Sphinx project directory, add or modify the latex_elements variable to specify the use of the custom template:
+
+python
+Copy code
+latex_elements = {
+    'papersize': 'letterpaper',
+    'pointsize': '10pt',
+    'classoptions': ',openany',
+    'babel': '\\usepackage[english]{babel}',
+    'preamble': '\\input{preamble.tex}',
+    'sphinxsetup': 'VerbatimBorderColor={rgb}{1,1,1}',
+    'maketitle': '\\input{custom_sphinxmanual.cls}',  # Use the custom template
+}
+Replace 'custom_sphinxmanual.cls' with the name of your custom template file.
+
+Step 5: Generate the PDF
+Regenerate the documentation using make clean followed by make latexpdf. This will use the modified template to generate the PDF, including the customized title page.
+
+Ensure to adjust the LaTeX commands in the copied file (custom_sphinxmanual.cls) as per your requirements. This method allows you to have full control over the title page layout and contents in your Sphinx-generated PDF.
+
+</details>