Fuzzy Images in Auth Code Flow

**Is your feature request related to a problem? Please describe.**
The images on the [auth code flow](https://azure.github.io/apim-lab/apim-lab/7-security/apimanagement-7-3-3-Oauth2-AuthorizationGrantFlow.html) have an arrow on the right hand side that doesn't seem like it should be there. Additionally, some of the images contain very small text that is hard to read ([small img 1](https://azure.github.io/apim-lab/assets/images/authflow7.png) | [small img 2](https://azure.github.io/apim-lab/assets/images/authflow10.png) | [small img 3](https://azure.github.io/apim-lab/assets/images/authflow12.png) | [small img 4](https://azure.github.io/apim-lab/assets/images/authflow13.png) ).

**Describe the solution you'd like**
Making these images readable or with alt text would be nice.

**Describe alternatives you've considered**
N/A

**Additional context**
N/A