[wiki] Fix links to various wiki pages

wiki/install.md

@@ -1,12 +1,12 @@
 ## Installation
 MUTN is still in early development and thus no installation packages are officially distributed.
 
-For now, please manually install the binaries from the [latest release](https://github.com/rwinkhart/MUTN/releases) or [compile from source](https://github.com/rwinkhart/MUTN/blob/main/wiki/MUTN/build.md). All pre-built binaries were compiled with CGO disabled and thus are libc-independent.
+For now, please manually install the binaries from the [latest release](https://github.com/rwinkhart/MUTN/releases) or [compile from source](https://github.com/rwinkhart/MUTN/blob/main/wiki/build.md). All pre-built binaries were compiled with CGO disabled and thus are libc-independent.
 
 Additionally, MUTN is available as a source package ("mutn") on the AUR.
 
 Please note that the server binary must be called "libmuttonserver" in order for clients to successfully reach it.
 
-After placing the binaries in your $PATH, it is highly recommended to also download and correctly place/source the relevant [shell completions scripts](https://github.com/rwinkhart/MUTN/blob/main/wiki/MUTN/completions.md).
+After placing the binaries in your $PATH, it is highly recommended to also download and correctly place/source the relevant [shell completions scripts](https://github.com/rwinkhart/MUTN/blob/main/wiki/completions.md).
 
-Please see the [usage guide](https://github.com/rwinkhart/MUTN/blob/main/wiki/MUTN/usage.md) for help getting started.
+Please see the [usage guide](https://github.com/rwinkhart/MUTN/blob/main/wiki/usage.md) for help getting started.