Intro refactoring

[valer1435]

https://github.com/nccr-itmo/FEDOT/issues/878 issue. Advices are welcome

[codecov[bot]]

Codecov Report

Merging #917 (cc71a10) into master (c8fac00) will decrease coverage by 0.09%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #917      +/-   ##
==========================================
- Coverage   88.30%   88.21%   -0.10%     
==========================================
  Files         203      203              
  Lines       13411    13317      -94     
==========================================
- Hits        11842    11747      -95     
- Misses       1569     1570       +1     

Impacted Files	Coverage Δ
fedot/api/main.py	81.21% <ø> (ø)
fedot/explainability/explainer_template.py	75.00% <0.00%> (-5.00%)	:arrow_down:
...on_implementations/models/discriminant_analysis.py	90.56% <0.00%> (-3.88%)	:arrow_down:
...implementations/data_operations/sklearn_filters.py	94.49% <0.00%> (-1.84%)	:arrow_down:
fedot/core/repository/tasks.py	72.72% <0.00%> (-1.56%)	:arrow_down:
fedot/core/caching/base_cache.py	66.66% <0.00%> (-1.52%)	:arrow_down:
...ations/data_operations/sklearn_imbalanced_class.py	96.34% <0.00%> (-1.22%)	:arrow_down:
fedot/core/data/multi_modal.py	84.37% <0.00%> (-1.21%)	:arrow_down:
...edot/api/api_utils/assumptions/task_assumptions.py	78.18% <0.00%> (-1.13%)	:arrow_down:
.../core/optimisers/opt_history_objects/individual.py	82.97% <0.00%> (-1.03%)	:arrow_down:
... and 46 more

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[nicl-nno]

Вот на эту страничнку бы ещё какой-то вводный текст.

[valer1435]

https://github.com/nccr-itmo/FEDOT/blob/intro-refactoring/docs/source/introduction/index.rst добавил текст