Add missing packages to build instructions

[Kuratius]

On ubuntu, these are not available by default.
Some of the crates are not native rust and instead just wrap these packages and will fail compilation without them being available.
sudo apt install libgtk-3-dev libatk1.0-dev libgdk-pixbuf-2.0-dev libpango1.0-dev

[Kuratius]

full list of external libraries (for running, not necessarily compiling): ldd ./leafish
linux-vdso.so.1 (0x00007ffdc6ec5000)
libgtk-3.so.0 => /lib/x86_64-linux-gnu/libgtk-3.so.0 (0x00007ff5a57ee000)
libgobject-2.0.so.0 => /lib/x86_64-linux-gnu/libgobject-2.0.so.0 (0x00007ff5a578e000)
libfreetype.so.6 => /lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007ff5a56c6000)
libfontconfig.so.1 => /lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007ff5a567c000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff5a5595000)
libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007ff5a5569000)
libxcb-render.so.0 => /lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007ff5a555a000)
libxcb-shape.so.0 => /lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007ff5a5555000)
libxcb-xfixes.so.0 => /lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007ff5a554b000)
libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007ff5a5504000)
libssl.so.3 => /lib/x86_64-linux-gnu/libssl.so.3 (0x00007ff5a5460000)
libcrypto.so.3 => /lib/x86_64-linux-gnu/libcrypto.so.3 (0x00007ff5a501b000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff5a4ffb000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff5a4dd3000)
/lib64/ld-linux-x86-64.so.2 (0x00007ff5a7f4b000)
libgdk-3.so.0 => /lib/x86_64-linux-gnu/libgdk-3.so.0 (0x00007ff5a4ccc000)
libgmodule-2.0.so.0 => /lib/x86_64-linux-gnu/libgmodule-2.0.so.0 (0x00007ff5a4cc5000)
libpangocairo-1.0.so.0 => /lib/x86_64-linux-gnu/libpangocairo-1.0.so.0 (0x00007ff5a4cb3000)
libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007ff5a4b71000)
libXi.so.6 => /lib/x86_64-linux-gnu/libXi.so.6 (0x00007ff5a4b5d000)
libXfixes.so.3 => /lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007ff5a4b55000)
libcairo-gobject.so.2 => /lib/x86_64-linux-gnu/libcairo-gobject.so.2 (0x00007ff5a4b49000)
libcairo.so.2 => /lib/x86_64-linux-gnu/libcairo.so.2 (0x00007ff5a4a21000)
libgdk_pixbuf-2.0.so.0 => /lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so.0 (0x00007ff5a49f1000)
libatk-1.0.so.0 => /lib/x86_64-linux-gnu/libatk-1.0.so.0 (0x00007ff5a49c5000)
libatk-bridge-2.0.so.0 => /lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0 (0x00007ff5a498d000)
libepoxy.so.0 => /lib/x86_64-linux-gnu/libepoxy.so.0 (0x00007ff5a4858000)
libfribidi.so.0 => /lib/x86_64-linux-gnu/libfribidi.so.0 (0x00007ff5a483c000)
libgio-2.0.so.0 => /lib/x86_64-linux-gnu/libgio-2.0.so.0 (0x00007ff5a4664000)
libpangoft2-1.0.so.0 => /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0 (0x00007ff5a4649000)
libpango-1.0.so.0 => /lib/x86_64-linux-gnu/libpango-1.0.so.0 (0x00007ff5a45e0000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007ff5a44a6000)
libharfbuzz.so.0 => /lib/x86_64-linux-gnu/libharfbuzz.so.0 (0x00007ff5a43d7000)
libffi.so.8 => /lib/x86_64-linux-gnu/libffi.so.8 (0x00007ff5a43ca000)
libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007ff5a438f000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff5a4371000)
libbrotlidec.so.1 => /lib/x86_64-linux-gnu/libbrotlidec.so.1 (0x00007ff5a4363000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007ff5a4332000)
libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007ff5a4329000)
libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007ff5a4323000)
libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007ff5a431b000)
libXinerama.so.1 => /lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007ff5a4314000)
libXrandr.so.2 => /lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007ff5a4307000)
libXcursor.so.1 => /lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007ff5a42fb000)
libXcomposite.so.1 => /lib/x86_64-linux-gnu/libXcomposite.so.1 (0x00007ff5a42f6000)
libXdamage.so.1 => /lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007ff5a42f1000)
libwayland-cursor.so.0 => /lib/x86_64-linux-gnu/libwayland-cursor.so.0 (0x00007ff5a42e5000)
libwayland-egl.so.1 => /lib/x86_64-linux-gnu/libwayland-egl.so.1 (0x00007ff5a42e0000)
libwayland-client.so.0 => /lib/x86_64-linux-gnu/libwayland-client.so.0 (0x00007ff5a42cf000)
libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007ff5a42ba000)
libpixman-1.so.0 => /lib/x86_64-linux-gnu/libpixman-1.so.0 (0x00007ff5a420f000)
libxcb-shm.so.0 => /lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007ff5a4208000)
libXrender.so.1 => /lib/x86_64-linux-gnu/libXrender.so.1 (0x00007ff5a41fb000)
libjpeg.so.8 => /lib/x86_64-linux-gnu/libjpeg.so.8 (0x00007ff5a417a000)
libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007ff5a412c000)
libatspi.so.0 => /lib/x86_64-linux-gnu/libatspi.so.0 (0x00007ff5a40f2000)
libmount.so.1 => /lib/x86_64-linux-gnu/libmount.so.1 (0x00007ff5a40ac000)
libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007ff5a4080000)
libthai.so.0 => /lib/x86_64-linux-gnu/libthai.so.0 (0x00007ff5a4075000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007ff5a3fff000)
libgraphite2.so.3 => /lib/x86_64-linux-gnu/libgraphite2.so.3 (0x00007ff5a3fd8000)
libbrotlicommon.so.1 => /lib/x86_64-linux-gnu/libbrotlicommon.so.1 (0x00007ff5a3fb3000)
libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007ff5a3f9b000)
libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007ff5a3ed4000)
libblkid.so.1 => /lib/x86_64-linux-gnu/libblkid.so.1 (0x00007ff5a3e9d000)
libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007ff5a3e06000)
libdatrie.so.1 => /lib/x86_64-linux-gnu/libdatrie.so.1 (0x00007ff5a3dfb000)
libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x00007ff5a3dee000)
liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007ff5a3dc3000)
libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007ff5a3cf4000)
liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007ff5a3cd4000)
libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007ff5a3cc9000)
libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007ff5a3b89000)
libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007ff5a3b63000)

[skillman623]

Fixed in #356