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

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

docs/book/src/building/linux.md

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+# Linux
+
+Instructions for building this project on Linux.
+
+## Arch Linux
+
+Arch users can build the latest version of the project from the AUR package `video2x-git`. The project's repository also contains another PKGBUILD example at `packaging/arch/PKGBUILD`.
+
+```bash
+# Build only
+git clone https://aur.archlinux.org/video2x-git.git
+cd video2x-git
+makepkg -s
+```
+
+To build manually from the source, follow the instructions below.
+
+```bash
+# Install build and runtime dependencies
+# See the PKGBUILD file for the list of up-to-date dependencies
+pacman -Sy ffmpeg ncnn vulkan-driver opencv spdlog boost-libs
+pacman -Sy git cmake make clang pkgconf vulkan-headers openmp boost
+
+# Clone the repository
+git clone --recurse-submodules https://github.com/k4yt3x/video2x.git
+cd video2x
+
+# Build the project
+make build
+```
+
+The built binaries will be located in the `build` directory.
+
+## Ubuntu
+
+Ubuntu users can use the `Makefile` to build the project automatically. The `ubuntu2404` and `ubuntu2204` targets are available for Ubuntu 24.04 and 22.04, respectively. `make` will automatically install the required dependencies, build the project, and package it into a `.deb` package file. It is recommended to perform the build in a container to ensure the environment's consistency and to avoid leaving extra build packages on your system.
+
+```bash
+# make needs to be installed manually
+sudo apt-get update && sudo apt-get install make
+
+# Clone the repository
+git clone --recurse-submodules https://github.com/k4yt3x/video2x.git
+cd video2x
+
+# Build the project
+make ubuntu2404
+```
+
+The built `.deb` package will be located under the current directory.