Update PlacesDetailPanel with more flexible styling

[ajolipa]

In this PR

• Edits the CSS of the core-data/PlacesDetailPanel component to remove the absolute positioning and fixed width;
• Adds user stories showing use of the component inside a semantic-ui-react Sidebar component and Modal component

Notes

Unsure about the best way to structure this change; as is, it's sort of a breaking change in that existing uses of the panel as a sidebar specifically will need to be updated to actually wrap the component in a sidebar other custom styled component to recover the same behavior. Alternatively we could force backward compatibility by passing some sort of optional modal flag as a prop and only apply the updated CSS if that flag is applied, but that seems significantly less elegant. Open to thoughts!

[ajolipa]

Added some Tailwind examples to the Storybook page. @dleadbetter

[ajolipa]

Closing and reopening to try to get GitHub to update the file diffs.