Update installation guide: clarify SQLite3 usage and improve formatting

Author: Vadym-Kharchenko

docs/site/installation.md

@@ -1,6 +1,9 @@
-## CRM Software installation
+## installation of CRM Software 
 
-To deploy the customer CRM software, you will need: [<img src="../icons/python-logo.svg" alt="python logo" width="30" height="30"> Python](https://www.python.org/){target="_blank"} 3.10+ and database.  
+To deploy the customer CRM software, you will need
+[<img src="../icons/python-logo.svg" alt="python logo" width="30" height="30"> Python](https://www.python.org/){target="_blank"} 3.10+.  
+For initial familiarization with the CRM, you can use the built-in SQLite3 database (default settings),
+but it is not suitable for regular use.  
 This [Python CRM software](https://github.com/DjangoCRM/django-crm/){target="_blank"} is developed taking into account compatibility with databases:
 
 - [<img src="../icons/mysql_logo.svg" alt="mysql logo" width="30" height="30"> MySQL](https://www.mysql.com/){target="_blank"} 8.0.11+
@@ -32,7 +35,7 @@ The project will be cloned into the "django-crm" folder.
 
 ### Free CRM software download
 
-You can simply download the CRM software as a zip file and then unzip it to a directory of your choice.
+You can download the CRM software as a zip file and then unzip it to a directory of your choice.
 
 <a class="btn button" href="https://github.com/DjangoCRM/django-crm/archive/refs/heads/main.zip" style="margin-left: 20%">Download CRM Software</a>
 
@@ -41,7 +44,7 @@ You can simply download the CRM software as a zip file and then unzip it to a di
 To run CRM software on your computer/server, you need to install certain dependencies.  
 It is recommended to first create and activate a Python virtual environment:
 
-| action   | on Unix/macOS                 | on Windows                |
+| Action   | Unix/macOS                    | Windows                   |
 |----------|-------------------------------|---------------------------|
 | create   | `python3 -m venv myvenv`      | `py -m venv myvenv`       |
 | activate | `source /myvenv/bin/activate` | `myvenv\Scripts\activate` |