add send to pheno ex button, obsolete node, misc

[vincerubinetti]

closes #473
closes #481
closes #475

• add more explanation and icon to banner about feedback form
• expose imperative "runsearch" func from tags component
• show text next to table expand/collapse button to make more obvious
• modify phenotype explorer to accept search term from history state
• add button to node page association section to send phenotypes to pheno explorer
• add strikethrough for deprecated nodes

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