Footer icons dimensions

[koeaw]

We don't set the width and height of the icons in the footer in a consistent way, which doesn't allow easy adjustments.

The Git and Swagger icons are set via HTML attributes:

apis-core-rdf/apis_core/core/templates/partials/footer-left.html

Lines 10 to 19 in ed7c1d2

	{% if swagger_ui %}
	<a href="{{ swagger_ui }}" title="Swagger UI">
	<img src="{% static "/img/Swagger-logo.png" %}" height="24px">
	</a>
	{% endif %}
	{% git_repository_url as repository_url %}
	{% if repository_url %}
	<a href="{{ repository_url }}" title="Git repository">
	<img src="{% static "/img/Git-Icon-1788C.png" %}" height="24px">
	</a>

The ACDH-CH logo's height is set via a CSS ID selector:

apis-core-rdf/apis_core/core/static/css/core.css

Lines 1 to 4 in ed7c1d2

	/* project/site logo in footer */
	#logo {
	height: 1.5em;
	}

The API icon's size is determined by a site-wide class for Material Icons:

apis-core-rdf/apis_core/core/static/css/material-symbols.css

Lines 7 to 20 in ed7c1d2

	.material-symbols-outlined {
	font-family: 'Material Symbols Outlined';
	font-weight: normal;
	font-style: normal;
	/* preferred icon size */
	font-size: 24px;
	display: inline-block;
	line-height: 1;
	text-transform: none;
	letter-spacing: normal;
	word-wrap: normal;
	white-space: nowrap;
	direction: ltr;
	}

A shared class, e.g. icons or app-icons, apis-icons (to avoid clashes with other libraries) would be preferable.