Improve badges and verifiable credentials documentation (#2968)

* docs: update readme and fix typos in credentials sharing docs

* docs(vc): move credentials sharing docs under the same parent dir

* docs: major docs refresh and improvement

* docs: finalize c4 diagrams and text enhancements

* docs: major update and docs polishing for credentials sharing

* docs: update diagrams and screenshots for badges and credentials sharing

Add new badge admin screenshots (Accredible API config, activation,
Credly organization) and processing flow diagram. Update C4 architecture
diagrams and optimize existing image assets.

* docs: improve badges documentation with provider configs and quickstart

Enhance badge provider configuration docs for Accredible and Credly.
Rewrite quickstart guide with prerequisites and step-by-step flow.
Update configuration index, management, processing, examples, and
settings pages for accuracy and clarity.

* docs: revise verifiable credentials documentation and add managing guide

Rewrite components, quickstart, and configuration pages for clarity.
Add new managing guide for credential lifecycle operations. Update
overview, storages, extensibility, composition, tech details, and
API reference sections.

* docs: update sharing section index with revised structure

* docs: enhance host in template urls wording

* docs: correct wording based on the feedback after refactoring

* docs: small sentance adjustment

* docs: additional corrections and elaboration

* docs: fix broken link