Getting started and Readme files updated

[davorrunje]

Description

Updates documentation for 0.2 release.

Type of change

• Documentation (typos, code examples, or any documentation updates)

Checklist

• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
docs/docs_src/tutorial/giphy/simple_main.py	0.00%	7 Missing ⚠️

Files with missing lines	Coverage Δ
docs/docs_src/getting_started/main_console.py	100.00% <100.00%> (ø)
docs/docs_src/getting_started/main_mesop.py	0.00% <ø> (ø)
docs/docs_src/tutorial/giphy/simple_main.py	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes