docs(book): added the docs.video2x.org mdBook source files and pipeline

Signed-off-by: k4yt3x <i@k4yt3x.com>

docs/book/src/SUMMARY.md

@@ -0,0 +1,35 @@
+# Summary
+
+[Introduction](README.md)
+
+# Building
+
+- [Building](building/README.md)
+  - [Windows](building/windows.md)
+  - [Windows (Qt6)](building/windows-qt6.md)
+  - [Linux](building/linux.md)
+
+# Installing
+
+- [Installing](installing/README.md)
+  - [Windows (Command Line)](installing/windows.md)
+  - [Windows (Qt6 GUI)](installing/windows-qt6.md)
+  - [Linux](installing/linux.md)
+
+# Running
+
+- [Running](running/README.md)
+  - [Desktop](running/desktop.md)]
+  - [Command Line](running/command-line.md)
+  - [Container](running/container.md)
+
+# Developing
+
+- [Developing](developing/README.md)
+  - [Architecture](developing/architecture.md)
+  - [libvideo2x](developing/libvideo2x.md)
+
+# Other
+
+- [Other](other/README.md)
+  - [History](other/history.md)