Updated hourly-table colors and sections

[partly-igor]

What does this PR do? 🛠️

This PR updates the colors of the hourly-table to further differentiate the time header row. It will also add zebra striping and to help distinguish the rows and removes row borders. It adds back in the "Alert" label for that row so that it's clear what is in the row when the hazard occurs later in the day. Additionally it separates out the alerts section into a separate tbody from the rest of the variables. This helps create consistent coloring for the remaining rows.

Screenshots (if appropriate): 📸

[eric-gade]

TIL: multiple tbody in a table is spec compliant!

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[github-actions]

This PR modifies theme Javascript or CSS assets but does not update the theme libraries file. Did you mean to update the appropriate version information in the libraries file?