Move repo from git to gitea

Signed-off-by: Boris Yumankulov <boria138@altlinux.org>

documentation/theme_guide/README.md

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+📘  Эта документация также доступна на [русском](README.ru.md)
+
+---
+
+## 📋 Contents
+- [Overview](#overview)
+- [Creating the Theme Folder](#creating-the-theme-folder)
+- [Style File](#style-file)
+- [Metadata](#metadata)
+- [Screenshots](#screenshots)
+- [Fonts and Icons](#fonts-and-icons)
+
+---
+
+## 📖 Overview
+
+Themes in `PortProtonQT` allow customizing the UI appearance. Themes are stored under:
+
+- `~/.local/share/PortProtonQT/themes`.
+
+---
+
+## 📁 Creating the Theme Folder
+
+```bash
+mkdir -p ~/.local/share/PortProtonQT/themes/my_custom_theme
+```
+
+---
+
+## 🎨 Style File (`styles.py`)
+
+Create a `styles.py` in the theme root. It should define variables or functions that return CSS.
+
+**Example:**
+```python
+def custom_button_style(color1, color2):
+    return f"""
+    QPushButton {{
+        background: qlineargradient(x1:0, y1:0, x2:1, y2:0,
+                                    stop:0 {color1}, stop:1 {color2});
+    }}
+    """
+```
+
+---
+
+## 📝 Metadata (`metainfo.ini`)
+
+```ini
+[Metainfo]
+name = My Custom Theme
+author = Your Name
+author_link = https://example.com
+description = Description of your theme.
+```
+
+---
+
+## 🖼 Screenshots
+
+Folder: `images/screenshots/` — place UI screenshots there.
+
+---
+
+## 🔡 Fonts and Icons (optional)
+
+- Fonts: `fonts/*.ttf` or `.otf`
+- Icons: `images/icons/*.svg/.png`
+
+---