Docs: Update getting started page to reflect that the overview is something else than the tutorials

[EwoutH]

Currently the Getting started page lists the Overview within the tutorials:

mesa/docs/getting_started.md

Lines 6 to 12 in c5eb0ce

	## Tutorials
	If you want to get a quick start on how to build agent based models with MESA, check the overview and tutorials:
	- [Overview of the MESA library](overview): Learn about the core concepts and components of Mesa.
	- [Creating Your First Model](tutorials/0_first_model): Learn how to create your first Mesa model.
	- [Adding Space](tutorials/1_adding_space): Learn how to add space to your Mesa model and understand Mesa's space architecture.
	- [Collecting Data](tutorials/2_collecting_data): Learn how to collect model level and agent level data with Mesa' DataCollector.

I find that a tad confusing, since the overview is not a tutorial in itself. So I think is should be listed seperately, that it's clear that these two are different:

• I want to view (passively) an overview of the Mesa features and capabilities
• I want to learn to build models (actively) using Mesa features and capabilities

[dhiraj-143r]

assign me plz i am interested in it

[EwoutH]

Go ahead!

Please do read our Contributing guide though.

[dhiraj-143r]

sure , working on it

[dhiraj-143r]

separated overview from tutorials , this is how its look now

if any further changes required let me know