Improve branding of single page HTML documents

[cwickham]

An easy entry point to Quarto for a lot of people is stand-alone HTML pages (as opposed to HTML pages in a website).
These currently get minimal impact from brand particularly for brands with black text on white backgrounds.

Example

_brand.yml

color:
  primary: "#447099"
logo:
  small: Posit-Logos-2024_horiz-white.svg

A standalone HTML page:

---
title: Standalone document
author: Charlotte Wickham
---

## Introduction

<http://quarto.org>

{{< lipsum  1 >}}

Current treatment:

Suggestions

One approach might be to fake a "navbar" just to add a band of color and logo. E.g. equivalent to adding _quarto.yml:

project: 
  type: website

website:
  search: false
  navbar: 
    pinned: true

[cscheid]

I'd like for single documents to support sidebars and navbars (optionally), and then we'd get that for free.

[send2dan]

I spent quite some time today trying to get logo to display in a stand-alone HTML pages as it's not entirely obvious that sidebars and navbars aren't affected through _brand.yml

[cwickham]

@send2dan To be clear, sidebars and navbars are affected through _brand.yml, but the only way to get them is through a website project, not stand-alone HTML pages.