Out of Date build directions in Readme_Developer.md

[shitwolfymakes]

OS version: Linux ubuntu-desktop-1 6.2.0-35-generic (Ubuntu 22.04 LTS)

Description of the problem including expected versus actual behavior:
Tried to build this following the instructions in Readme_Developer.md, an ran into a failure.

1. Following the guide, I tried to build using Qt 5.15.2. The CMake configuration step fails because the CMakeLists.txt actually requires Qt 6.5+.
2. The guide fails to include an install command for Ubuntu/Debian systems, apt install sqlite3 worked for me.
3. Building a configured project fails with the error xcb/xcb_keysyms.h: No such file or directory at uglobalhotkeys.h:9 and hotkeymap.h:129. A note to install the XCB library should be included alongside SQLite3. The working command for that is: apt install libxcb-keysyms1-dev for Ubuntu/Debian. The installation command will vary for yum and pacman-based systems.
4. Not a build error, but the document refers to the qmake ashirt.pro build file instead of the new CMakeLists.txt file.

Steps to reproduce: Try to build on an Ubuntu 22.04 system following the guide.

[jkennedyvz]

Thanks for pointing this out. Current build "documentation" is the github actions workflow. I can take some time this quarter to clean up the dev instructions to reflect this year's changes.