DOJO(admin) Manage exercises tab

[flacial]

Create this page https://www.figma.com/file/f9xRyl1bJOjtBRd8zFORzg/c0d3?node-id=204%3A4588

Things need to be done before creating the page:

• ~~Create the Exercise card~~
• Create a search/filtering input
• ~~Add flagged and flaggedReason columns to the Exercise model~~

[evo777]

Figma is good.

[flacial]

Filtering box and pagination are what's remaining.