feat(SHS-5954): Allow mailto links for social media block #1229

Job	Run time
set_sites	51s
lint_theme	55s
test_phpunit	1m 27s
test_new_site	13m 1s
test_existing_site (amstudies)	7m 46s
test_existing_site (chemistry)	14m 51s
test_existing_site (dlcl)	11m 4s
test_existing_site (economics)	10m 9s
test_existing_site (ethicsinsociety)	8m 27s
test_existing_site (finance_humsci)	6m 10s
test_existing_site (hps)	6m 59s
test_existing_site (hs_colorful)	9m 40s
test_existing_site (hsweb_userguide)	6m 35s
test_existing_site (sgs)	9m 59s
deploy_branch	1m 54s
	1h 49m 48s

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