Update get-involved.md

[brockhigg10]

Update to "Contribute to next priorities" section:

• delete icon component
• delete standard page template (we aren't actually accepting contributions for these)

Replace w/:

• Data table & tag components

Update "coming soon" section:

• add Date input

NOTE: For future, "contribute to next priorities" section will not include dates for the components. We will also only list components in this section that we are actually accepting contributions that we would be willing to incorporate. Icons and standard page template aren't really open for contribution at this stage. Data table and tag components are.

This release was also pushed without modifying the "Contribute to next priorities" issue section in Github (see attached image). The old content was listed as the three drop down options. This needs to be modified.

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