Alt text is not descriptive [CLI pages]

**Describe the content issue**:
Images listed below do not have descriptive/informative alt text. For markdown the alt text is located between the square brackets, ``.

The list below isn't exhaustive since I found these images based on the word count for the alt text, but it should be a good starting point to make our alt text better for people who use screen readers.

Some resources to help write alt text:
- https://webaim.org/techniques/alttext/
- https://www.a11yproject.com/posts/are-you-making-these-five-mistakes-when-writing-alt-text/

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/index.mdx:
```
53
54: 
55
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/hosting/index.mdx:
```
95
96: 
97
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/migration/aws-cdk-migration/index.mdx:
```
83
84: 
85 And update amplify/backend/custom//cdk-stack.ts for custom categories as shown below:
86
87: 
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/plugins/architecture/index.mdx:
```
54
55: 
56

77
78: 
79
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/project/troubleshooting/index.mdx:
```
228
229: 
230

294
295: 
296
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/teams/index.mdx:
```
52
53: 
54

56
57: 
58

60
61: 
62

64
65: 
66
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/teams/multi-frontend/index.mdx:
```
54
55: 
56
```

 

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli/usage/containers/index.mdx:
```
453
454: 
455
```

https://github.com/aws-amplify/docs/blob/main/src/pages/[platform]/tools/cli-legacy/relational-databases/index.mdx:
```
65
66: 
67

69
70: 
71

73
74: 
75

77
78: 
79

81
82: 
83

85
86: 
87

89
90: 
91

97
98: 
99

118
119: 
120

148
149: 
150

157
158: 
159
```