Website UX fixes

[clacladev]

What does this pull request do? Explain your changes. (required)
Addressed a series of UX issues on Dashboard part of the app.

Specific updates (required)

• Fixes the rounded corners issue described here
• On https://livepeer.studio/dashboard, under the "Create your own live stream", where it says "like OBS Studio or streamlabs. Here’s how.", there should be a colon after "here's how:"
• On all dashboard pages, links/button use blue text, but so do some of the headings. Can we use different colors to make it clear what’s clickable and what’s not? (If the brand guide / design allows it.)
• On https://livepeer.studio/dashboard/assets, the "Learn more -->" button leads to a 404.
  Same thing for the other Docs links on the main dashboard page,
• On https://livepeer.studio/dashboard/assets, "Upload your first Video on Demand asset" should become "Upload your first On Demand asset", to align with the feature's brand.
• On https://livepeer.studio/dashboard/assets, "Video on Demand" shouldn't be capitalized, because it's describing the On Demand feature, which is capitalized because it's a branded feature term. The same is true for video on demand vs On Demand elsewhere on the dashboard or docs.

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• How did you test each of these updates (required)

Before and after making the change I took a screenshot of the element affected and manually testing with Light and Dark mode.

Does this pull request close any open issues?

Fixes #1255

Screenshots (optional):

Asset (before, after light, after dark)

Billing (before, after light, after dark)

Help (before, after light, after dark)

### Multistream dialog (before, after light, after dark)

Stream (before, after light, after dark)

Usage (before, after light, after dark)

[vercel]

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Name	Status	Preview	Updated
livepeer-studio	✅ Ready (Inspect)	Visit Preview	Sep 12, 2022 at 3:48PM (UTC)

[clacladev]

Here the video player corner radius fix

Before

After

[adamsoffer]

Looks good! Thanks @clacladev

[codecov]

Codecov Report

Merging #1266 (372f5bc) into master (1794bd9) will increase coverage by 0.09236%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##              master       #1266         +/-   ##
===================================================
+ Coverage   51.11983%   51.21219%   +0.09235%     
===================================================
  Files             66          66                 
  Lines           4331        4331                 
  Branches         785         785                 
===================================================
+ Hits            2214        2218          +4     
+ Misses          1838        1835          -3     
+ Partials         279         278          -1     

Impacted Files	Coverage Δ
packages/api/src/webhooks/cannon.ts	49.70760% <0.00000%> (+2.33917%)	⬆️

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Impacted Files	Coverage Δ
packages/api/src/webhooks/cannon.ts	49.70760% <0.00000%> (+2.33917%)	⬆️