Streamwatch updates

[ptomasula]

cc: @aufdenkampe

Related Issues

669 #670 #671 #672 #677

Purpose

This PR is a collection of enhancements and feature requests related to the StreamWatch Schools program.

Summary of changes

• Updated StreamWatch schools logo.
• Revisions to the StreamWatch Schools section of the home page, clarifying instructions and improving navigation.
• Added new filter query parameters to the browse sites page.
• Added filter search feature to user selection on main StreamWatch Schools form
• Adds support for site photo uploads to StreamWatch Schools form
• Adds non-detect and range validation to chemical constituents
• Adds new macro invertebrates subform to the StreamWatch Schools form
• Updates StreamWatch summary table to include select parameters