docs: fix some errors and add pydantic to dependency

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -5.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (8f6b4cb3a827161f25870f0252a2b48aa329d220) | 2879 | 2799 | 97.22% | | | Head commit (f972e349bc790b8bca29e50064e9e7831b5bc6c1) | 2879 (+0) | 2799 (+0) | 97.22% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#141) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.97%. Comparing base (8f6b4cb) to head (f972e34).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #141 +/- ## ======================================= Coverage 96.97% 96.97% ======================================= Files 26 26 Lines 2872 2872 ======================================= Hits 2785 2785 Misses 64 64 Partials 23 23 ```

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