we lose our search if we click on a project and navigate back

## Expected Behavior

A user's search should persist navigating to project's info page/until they clear their search
## Current Behavior

At the moment, we can search for projects based on the programming language they use.
If one clicks on a project to see a more detailed view of its info, then navigates back to `/projects`, they lose their search term
## Possible Solution

save the searched-for language to Redux
## Steps to Reproduce (for bugs)

1. visit `/projects`
2. search for a language in the dropdown, e.g. `JavaScript`
3. click on one of the project's, which will take you to `/projects/`
4. click on the back button in your browser

## Context

Users expect that when they search for a term, that search will be preserved until they clear it.