test: fixing folders structure for BE docs in docusaurus project

[amelnytskyi]

What ❔

• Removed obsolete Blogs and Tutorials docs
• fixing folders structure for BE docs (docusaurus project)

Why ❔

Checklist

• [ ] PR title corresponds to the body of PR (we generate changelog entries from PRs).
• [ ] Tests for the changes have been added / updated.
• [ ] Documentation comments have been added / updated.

[github-actions[bot]]

API E2E Test Results

207 tests  ±0   207 :white_check_mark: ±0   19s :stopwatch: -1s  14 suites ±0     0 :zzz: ±0    1 files   ±0     0 :x: ±0 

Results for commit af9edc20. ± Comparison against base commit 42fabcb7.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Unit Test Results

    4 files  ±0    263 suites  ±0   10m 56s :stopwatch: -11s 2 081 tests ±0  2 080 :white_check_mark: ±0  1 :zzz: ±0  0 :x: ±0  2 289 runs  ±0  2 288 :white_check_mark: ±0  1 :zzz: ±0  0 :x: ±0 

Results for commit af9edc20. ± Comparison against base commit 42fabcb7.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit af9edc2):

• https://staging-scan-v2--pr227-qa-613-fix-tests-doc-4b7uz9wm.web.app
• https://staging-storybook-scan-v2--pr227-qa-613-fix-tests-doc-ctwejmkw.web.app

_{(expires Fri, 19 Apr 2024 17:40:40 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: e508f9012944951194447cb8885950b451a24403}