feat: Update svg images in landing page

[nvh95]

Features

• Update svg images in landing page cc: @doanhuuviet
• Update primary color for light mode
• Update primary color for dark mode

Design token for reference:

/* You can override the default Infima variables here. */
:root {
  --ifm-color-primary: #2e8555;
  --ifm-color-primary-dark: #29784c;
  --ifm-color-primary-darker: #277148;
  --ifm-color-primary-darkest: #205d3b;
  --ifm-color-primary-light: #33925d;
  --ifm-color-primary-lighter: #359962;
  --ifm-color-primary-lightest: #3cad6e;
  --ifm-code-font-size: 95%;
}

/* For readability concerns, you should choose a lighter palette in dark mode. */
[data-theme='dark'] {
  --ifm-color-primary: #25c2a0;
  --ifm-color-primary-dark: #21af90;
  --ifm-color-primary-darker: #1fa588;
  --ifm-color-primary-darkest: #1a8870;
  --ifm-color-primary-light: #29d5b0;
  --ifm-color-primary-lighter: #32d8b4;
  --ifm-color-primary-lightest: #4fddbf;
}

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[nvh95]

Need to update primary color (light mode, dark mode) in the future

[nvh95]

@doanhuuviet I updated the svg to www.jest-preview.com
We will revisit to update the primary color in the future