docs: remove FOSSA license badge and check (#1644)

FOSSA is not a CNCF requirement for sandbox projects. The badge/check
was failing on unrelated third-party licenses with no actionable items
for the k8sgpt maintainers.

Changes:
- Removed FOSSA shield badge from README header
- Removed FOSSA large badge from the License section
- Removed  section heading (was only used for the FOSSA badge)
- Removed License entry from the TOC

The project is still licensed under Apache 2.0 (badge and LICENSE file unchanged).

Signed-off-by: Three Foxes (in a Trenchcoat) <threefoxesyes3inatrenchcoat@gmail.com>

README.md

@@ -9,7 +9,6 @@
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/k8sgpt-ai/k8sgpt)
 [![OpenSSF Best Practices](https://bestpractices.coreinfrastructure.org/projects/7272/badge)](https://bestpractices.coreinfrastructure.org/projects/7272)
 [![Link to documentation](https://img.shields.io/static/v1?label=%F0%9F%93%96&message=Documentation&color=blue)](https://docs.k8sgpt.ai/)
-[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fk8sgpt-ai%2Fk8sgpt.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Fk8sgpt-ai%2Fk8sgpt?ref=badge_shield)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 [![Go version](https://img.shields.io/github/go-mod/go-version/k8sgpt-ai/k8sgpt.svg)](https://github.com/k8sgpt-ai/k8sgpt)
 [![codecov](https://codecov.io/github/k8sgpt-ai/k8sgpt/graph/badge.svg?token=ZLR7NG8URE)](https://codecov.io/github/k8sgpt-ai/k8sgpt)
@@ -42,7 +41,6 @@ _Out of the box integration with OpenAI, Azure, Cohere, Amazon Bedrock, Google G
 - [Documentation](#documentation)
 - [Contributing](#contributing)
 - [Community](#community)
-- [License](#license)
 
 # CLI Installation
 
@@ -759,6 +757,3 @@ Find us on [Slack](https://join.slack.com/t/k8sgpt/shared_invite/zt-332vhyaxv-bf
   <img src="https://contrib.rocks/image?repo=k8sgpt-ai/k8sgpt" />
 </a>
 
-## License
-
-[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fk8sgpt-ai%2Fk8sgpt.svg?type=large)](https://app.fossa.com/projects/git%2Bgithub.com%2Fk8sgpt-ai%2Fk8sgpt?ref=badge_large)