Update docs

Author: thieu1995

docs/source/index.rst

@@ -1,8 +1,7 @@
 Welcome to MEALPY's documentation!
 ==================================
 
-
-.. image:: https://img.shields.io/badge/release-3.0.2-yellow.svg
+.. image:: https://img.shields.io/badge/release-3.0.3-yellow.svg
    :target: https://github.com/thieu1995/mealpy/releases
 
 .. image:: https://img.shields.io/pypi/wheel/gensim.svg

docs/source/pages/general/advance_guide.rst

@@ -1,4 +1,4 @@
-    =============
+=============
 Advance Guide
 =============
 

docs/source/pages/general/introduction.rst

@@ -5,10 +5,10 @@ Introduction
 **MEALPY** (MEta-heuristic ALgorithms in PYthon) is the most comprehensive Python library for cutting-edge, nature-inspired meta-heuristic algorithms.
 It is released under the **MIT** license.
 
-- **Current version:** 3.0.2
-- **Total algorithms:** 215
-  - 190 official (originals, hybrids, and variants)
-  - 25 custom-developed by our developers
+- **Current version:** 3.0.3
+- **Total algorithms:** 233
+  - 206 official (originals, hybrids, and variants)
+  - 27 custom-developed by our developers
 
 .. _All releases: https://pypi.org/project/mealpy/#history