Remove `<abbr>` from Altis link

[robindevitt]

Originally reported in humanmade/altis-cms#629

<abbr> is not an allowed element inside a link, see MDN on links

Code referenced:

altis-cloud/inc/environment_indicator/namespace.php

Lines 48 to 59 in 9c1bb94

	$envs = [
	'local' => esc_html_x( 'local', 'Server environment type', 'altis' ),
	'development' => sprintf( '<abbr title="%s">%s</abbr>',
	esc_attr_x( 'development', 'Server environment type - full form', 'altis' ),
	esc_html_x( 'dev', 'Server environment type - abbreviated', 'altis' )
	),
	'staging' => esc_html_x( 'staging', 'Server environment type', 'altis' ),
	'production' => sprintf( '<abbr title="%s">%s</abbr>',
	esc_attr_x( 'production', 'Server environment type - full form', 'altis' ),
	esc_html_x( 'prod', 'Server environment type - abbreviated', 'altis' )
	),
	];

Acceptance criteria:

• Remove the <abbr> element from the link being displayed.
• have the appropriate link title matching the environment.