Missing link for a-lists

[ksnortum]

The page https://scheme-book.ursliska.de/scheme/alists/index.html does not exists (and it should). It should probably be inserted into the Scheme book under "Compound Data Type" between "List and Pairs" and "Vectors".

[uliska]

I'll have to look into it. MkDocs actually should create a custom 404-"like" page.

[ksnortum]

I have since found that there is an alist page, it's just that this link doesn't point to it. The title should be, "Incorrect link to alist page."

Also, there is the whole "Working with lists" section still, but it's beneath "Concepts". So even if the link were corrected, it would be a forward reference.

[ksnortum]

Maybe the link could be https://scheme-book.ursliska.de/scheme/lists/README.html, although that's a intro page, not the section.

[ksnortum]

I found another bad link in https://scheme-book.ursliska.de/scheme/lists/filtering.html under the heading "Searching for elements in a list".

Maybe instead of me creating new issues or pull requests, should we have one issue called something like "Website structure" with all the bad links under that?

(My hope is that this will be helpful at some point when you aren't so busy.)