update design for Brave Rewards onboarding (first time view on opt in)

[mandar-brave]

• All titles for all panels need to be colored appropriately (based on design provided)
• Toggles for a-c and Ads Panel need to be turned ON (no toggle for Tips)
• All Panels should have bolded/colored explainer text (based on design provided)

@jenn-rhim @NejcZdovc

[btlechowski]

Verification passed on

Brave	0.61.37 Chromium: 73.0.3683.39 (Official Build) beta (64-bit)
Revision	cc53b0e12fcaf42e4bab8d6c23bd4fb7aae99f6c-refs/branch-heads/3683@{#413}
OS	Windows 7 Service Pack 1 Build 7601.24312

Used test plan from brave/brave-core#1574

Verification passed on

Brave	0.61.39 Chromium: 73.0.3683.39 (Official Build) beta (64-bit)
Revision	cc53b0e12fcaf42e4bab8d6c23bd4fb7aae99f6c-refs/branch-heads/3683@{#413}
OS	Linux Mint

• Verified the test plan test plan from Fixes on boarding boxes for rewards brave-core#1574

Verified passed with

Brave	0.61.45 Chromium: 73.0.3683.39 (Official Build) beta(64-bit)
Revision	cc53b0e12fcaf42e4bab8d6c23bd4fb7aae99f6c-refs/branch-heads/3683@{#413}
OS	Mac OS X

• Verified test plan from Fixes on boarding boxes for rewards brave-core#1574 (with the exception of the Ads panel, which is disabled/'Coming Soon' per Ads Panel in 0.61x should have Ads Coming Soon  #3500)

[GeetaSarvadnya]

As per the test plan brave/brave-core#1574. Toggle should be available for a-c and Ads Panel
On Linux - Toggle is not available for Ads, is this because Ads is not yet implemented for Linux platform?

@jenn-rhim @NejcZdovc

[NejcZdovc]

@GeetaSarvadnya ads are still disabled

[GeetaSarvadnya]

@NejcZdovc Do you mean Ads are still disabled on Linux platform. Hence the toggle switch is not shown?

[NejcZdovc]

@GeetaSarvadnya correct