feat: add exception for invalid documentation_viewer configuration.

[KonstantinLapkovsky]

Description

Add handling unsupported documentation viewer configuration. Throw the UnsupportedDocumentationViewerException exception if an invalid value was provided.

Fixes #93

Type of change

• [ ] New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[KonstantinLapkovsky]

@DenTray fixed! Please check it