remove direct installation command and clarify installation instructions in README

Author: programmersd21

README.md

@@ -23,10 +23,6 @@ Recommended terminals: Windows Terminal, WezTerm, Alacritty, kitty, Ghostty, iTe
 
 ## Installation
 
-```bash
-pip install halo
-```
-
 From source:
 
 ```bash
@@ -35,6 +31,12 @@ cd halo
 pip install -e .
 ```
 
+or shorter:
+
+```bash
+pip install git+https://github.com/programmersd21/halo.git
+```
+
 ## Usage
 
 ```bash