Various docs updates.
Initial file.
Initial acronyms.md file.
Updates.
The images for the reverse-shell.md file.
Updated the web-reverse-shell.md file.
Updated the reverse-shell.md file.
Updated the post-exploit-windows.md file.
Updated the _Sidebar.md file.
Initial powershell-cheat-sheet.md file.
Updated the resources.md file.
Updated the wi-fi.md file.
Updated the post-exploit-linux.md file.
Updated the network-discovery.md file.
Updated the information-gathering.md file.
Updates 1 2 3 ...