docs: update archlinux build instructions

Author: jfrader

doc/getting-started/getting-started/installation.md

@@ -417,8 +417,7 @@ sudo PATH="/usr/local/opt:$PATH"  LIBRARY_PATH=/opt/homebrew/lib CPATH=/opt/home
 Install dependencies:
 
 ```shell
-pacman --sync autoconf automake gcc git make python-pip
-pip install --user poetry
+pacman --sync autoconf automake gcc git make python-poetry python-mako lowdown jq
 ```
 
 Clone Core Lightning:
@@ -436,10 +435,10 @@ python -m poetry install
 python -m poetry run make
 ```
 
-Launch Core Lightning:
+Install
 
-```
-./lightningd/lightningd
+```shell
+sudo python -m poetry run make install
 ```
 
 ## To cross-compile for Android