feat: Added new floor sprites

[thedyze]

Checklist

Required

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Optional

• I have documented the changes in the appropriate location in the doc/ folder.

Purpose of change

To continue improving the BN graphics, specifically floors with this PR.

Describe the solution

This change adds new graphics for some of the more common floor tiles

• Linoleum white, gray
• Concrete
• Waxed floor + yellow variant

This changes concrete from a multi tile sprite in favor of a single tile with a weighted array fg, and a sand bg tile.
The multi tile wasn't really adding much for looks, it was more or less the same tile with some very basic highlights.

Additional context

Also moved a few lines in the documentation, which were listed under the incorrect file.

[autofix-ci]

Autofix has formatted code style violation in this PR.

I edit commits locally (e.g: git, github desktop) and want to keep autofix

1. Run git pull. this will merge the automated commit into your local copy of the PR branch.
2. Continue working.

I do not want the automated commit

1. Format your code locally, then commit it.
2. Run git push --force to force push your branch. This will overwrite the automated commit on remote with your local one.
3. Continue working.

If you don't do this, your following commits will be based on the old commit, and cause MERGE CONFLICT.