Add "Edit This Page" link to documentation

[Fabs97]

This PR closes #7280 by adding a new "Edit this page" link to the markdown page in Github.

To note the requested additions:

• Add an "Edit this page" button to the bottom of each documentation page
• Ensure that the button links directly to the Markdown file in the GitHub repository
• The link should open in edit mode if possible, so users can quickly make changes and propose pull requests
• The button link should be styled consistently with the rest of the documentation site and be easy to find

Additionally:
The link is currently added to the "Reference" pages only. The logic is handled by the Page.tsx component

Screenshot:

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[github-actions]

Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

Five 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	105.02 KB (🟡 +260 B)	209.32 KB
/500	105.02 KB (🟡 +260 B)	209.31 KB
/[[...markdownPath]]	106.87 KB (🟡 +260 B)	211.16 KB
/errors	105.23 KB (🟡 +259 B)	209.53 KB
/errors/[errorCode]	105.21 KB (🟡 +259 B)	209.5 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.

[harish-sethuraman]

@rickhanlonii this seems like a good idea? can we confirm if the design is fine? we can implement this if its okay with the team

[hichemfantar]

@Fabs97 thanks for the pr! can you properly link my issue #7280 by typing closes #7280 instead of solves issue #7280

[hichemfantar]

i introduced my own attempt #7298 which improves the design by making it match the rest of the website, adding proper spacing, and making it responsive.

The link also fully encompasses the icon and the text.

It also implements correct logic for generating the correct url for the file without fail.