Bump @lrnwebcomponents/md-block from 7.0.2 to 7.0.4

Bumps @lrnwebcomponents/md-block from 7.0.2 to 7.0.4.

Commits

• bf207d0 v7.0.4
• 6b29c26 work toward asset resolution for elmsln/issues#1472...
• 46eade0 tray overflow
• 8f65306 list from the docs
• b4a081c other links
• 9c509de Merge pull request #639 from elmsln/fire
• ac3f0e1 Merge pull request #638 from elmsln/master
• d1fd460 v7.0.3
• c375dfe table fix
• See full diff in compare view

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