Updates to support IESopt.jl v2.0.0

[sstroemer]

This pull request introduces several significant updates to the documentation and codebase for the IESopt project, focusing on configuration, updating processes, and code simplification. Key changes include the addition of new documentation pages, updates to the configuration handling, and the removal of deprecated functionalities.

Documentation Updates:

• Added a new page docs/pages/dev/updating.md to provide information about updating the project between specific versions, including breaking changes and new features in version 2.0.0.
• Introduced a configuration.md file in the docs/pages/manual/python/ directory, detailing how to configure the project using environment variables and .env files.
• Updated the table of contents in docs/index.md to include new documentation pages [1] [2].

Configuration Handling:

• Implemented a new Config class in src/iesopt/config.py to manage configuration options using environment variables and .env files.
• Updated pyproject.toml to include python-dotenv as a dependency for handling environment variables.

Codebase Simplification:

• Removed verbosity parameter from the run function in src/iesopt/iesopt.py (because this is now part of the top-level config) [1] [2] [3].
• Replaced deprecated IESoptLib references with IESopt.Assets in src/iesopt/iesopt.py [1] [2].

Version Updates:

• Updated the project version to 2.0.0 in pyproject.toml to reflect the new major release.

Removal of Deprecated Functionalities:

• Removed the log_welcome_msg function and related code from src/iesopt/julia/general.py.

These changes collectively enhance the project's documentation, streamline configuration management, and simplify the codebase by removing outdated components.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.58824% with 40 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/iesopt/julia/setup.py	62.31%	26 Missing ⚠️
src/iesopt/model.py	60.00%	4 Missing ⚠️
src/iesopt/config.py	89.28%	3 Missing ⚠️
src/iesopt/julia/util.py	66.66%	3 Missing ⚠️
src/iesopt/results.py	57.14%	3 Missing ⚠️
src/iesopt/julia/general.py	88.88%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/iesopt/iesopt.py	94.87% <100.00%> (-0.13%)	⬇️
src/iesopt/julia/general.py	92.00% <88.88%> (-3.24%)	⬇️
src/iesopt/config.py	89.28% <89.28%> (ø)
src/iesopt/julia/util.py	74.19% <66.66%> (+26.36%)	⬆️
src/iesopt/results.py	46.82% <57.14%> (+19.40%)	⬆️
src/iesopt/model.py	49.27% <60.00%> (+4.16%)	⬆️
src/iesopt/julia/setup.py	65.78% <62.31%> (-27.07%)	⬇️

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