Hover, selected states for App navigation

[tanmoyAtb]

closes #1678

This issue is quite an old one. I made the changes in point 1,
However the requested changes in 2, 3 didn't feel like it was improving UX, I left them out.
Let me know what you think if 2 or 3 are needed.

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Submission checklist:

Layout

• Change looks good in the desktop web ui
• Change looks good in the mobile web ui

Theme

• Components / elements inspected in light mode
• Components / elements inspected in dark mode

Billing

• Change applied to both files-ui and storage-ui

[render]

Your Render PR Server URL is https://storage-ui-stage-pr-2063.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c92vj28ivq0092g24n70.

[render]

Your Render PR Server URL is https://chainsafe-components-stage-pr-2063.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c92vj40ivq0092g24nkg.

[render]

Your Render PR Server URL is https://files-ui-stage-pr-2063.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c92vj5oivq0092g24np0.

[asnaith]

However the requested changes in 2, 3 didn't feel like it was improving UX, I left them out.
Let me what you think if 2 or 3 are needed.

I agree, doesn't seem necessary.

Changes look great. Nice improvement to the mobile menu's especially. I thought they would use the same colour but this looks better.

[Tbaut]

This is a bit conflicting with the design discussed here #1284 but I think this looks cool too

[tanmoyAtb]

This is a bit conflicting with the design discussed here #1284 but I think this looks cool too

Yup, I thought this version is more comfortable to the eyes.

[Tbaut]

nice!