Fix color mismatch

[HenrikJannsen]

The webpage use multiple different tones of the Bisq green.

• webpage app screenshot logo: #1ab323,
• icon: #2f951b,
• font: #2faf3d,
• screenshot market: #159c2d
• download button: #169d19
• Bisq logo: #2faf3d

Here the colors used in the Bisq 1 app:
-bs-color-primary: #25b135; (left menu, progr. indicator,...)
-bs-color-primary-dark: #2ea33c; (right menu, action button,...)

• Bisq OS app icon (OSX): #2faf3d
• logo in app: #25b135
• action button: #2ea33c
• buy button: #3ea34a
• font: #24b035
• info icon: #24b035