Change disabled buttons color in light mode to make it more visible (… #418

Job	Run time
build (production)	2m 47s
build (test)	2m 48s
Libvips tests (3.1)	2m 9s
test (3.1)	5m 53s
End to End testing (3.1)	2m 41s
test (3.2)	5m 51s
Libvips tests (3.2)	2m 6s
End to End testing (3.2)	2m 32s
test (.ruby-version)	8m 1s
Libvips tests (.ruby-version)	3m 8s
Elastic Search integration testing (3.1, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	4m 2s
End to End testing (.ruby-version)	2m 45s
Elastic Search integration testing (3.2, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	2m 53s
Elastic Search integration testing (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:...	2m 26s
Elastic Search integration testing (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:...	3m 7s
Elastic Search integration testing (.ruby-version, opensearchproject/opensearch:2)	3m 33s
	56m 42s

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