update docs

docs/before_installation/imporatnt_notes.md

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-# Important Notes
+# Important Notes
+
+📌 We do not recommended you to install Snigdha OS via VM ('Virtual Machine' = virtual machine), as it is optimized for use on real hardware or physical machine.
+
+📌 If there is an abnormal system shutdown occurs during installation, it is mainly due to the lack of available RAM (`nohang` kills the process to prevent the system from responding anymore).
+
+📌 The use of inactive RAM (idle) is probably greater than other distributions since Snigdha OS uses ZRAM and other modifications to improve the general performance of the system.
+
+📌 `Ventoy` doesn't seem to work properly because some users have reported problems. Use the utility you prefer such as, for example, dd to burn ISO to a USB stick.

docs/before_installation/system_requirements.md

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-# System Requirements
+# System Requirements
+
+## Minimum Requirements
+    - Any x86_64 processor
+    - 10 GB Diskspace
+    - 1 GB RAM
+
+## Recommended Requirements
+    - Core 2 Duo or Higher
+    - 30 GB HDD/SSD or More
+    - 2 GB RAM or Higher