feat: FunC cookbook page

[jeshecdom]

Closes #298. There are 3 pending algorithm/recipes described in separate issue #1094.

[jeshecdom]

I finalized a complete pass of the page. But, the following list of algorithms are still pending, because they were not easy to understand at first reading, and require much more time for analysis:

Needs to rework the example or add further code:

• How to iterate through a lisp-style list

Understand the algorithm fully:

• How to iterate a cell tree recursively
• Casting types in tuples
• Determine if tuples are equal

Puzzling and confusing algorithms that may require help:

• How to update the smart contract logic (no idea what to do with the TypeScript snippets... how they are used?)
• Modulo operations (completely confusing, no idea what the algorithm is talking about AT ALL)
• Generate an external address (puzzled by this one... what is the purpose of an external address and why do they need to be generated?)

Apart from the above, there are a lot of missing links. I need to do a second pass for filling broken and missing links after importing changes from main.

Maybe I'll leave the "Puzzling and confusing algorithms" for a later PR and just concentrate on finally making this PR ready for review, because this page has been exhausting to fix.

[github-actions]

To fix the formatting issues:

1. Install necessary dependencies: npm ci
2. Then, run this command:

npx remark -o --silent --silently-ignore languages/func/cookbook.mdx 

[jeshecdom]

The issue #1094 will be addressed in a separate PR, once I gather the information.

[github-actions]

Thanks for the updates. I flagged several items in languages/func/cookbook.mdx; please apply the inline suggestions.

[github-actions]

To fix the formatting issues:

1. Install necessary dependencies: npm ci
2. Then, run this command:

npx remark -o --silent --silently-ignore languages/func/cookbook.mdx