[beta] : added next/image component as MDX component

[shanudjn]

This PR is for the issue #4382

The PR contains:

1. Replacing img tag with next/image for IllustraionBlock and Illustration components
2. Added width and height in the places where the above mentioned components were used.

Assumption-

The values for width and height for the images were taken from the main beta documentation. I woud like to know if its the right way to set the width and height. Will will change it if its required.

Screenshots for sample

Sample 1	Sample 2

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Size Changes

📦 Next.js Bundle Analysis

This analysis was generated by the next.js bundle analysis action 🤖

Three Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/404	43.62 KB (🟡 +11 B)	132.81 KB
/500	43.6 KB (🟡 +11 B)	132.79 KB
/[[...markdownPath]]	43.79 KB (🟡 +11 B)	132.97 KB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

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