Use consistent woodpecker color scheme (#2003)

Fixes: https://github.com/woodpecker-ci/woodpecker/issues/1079

What do you think about using a consistent `woodpecker` color scheme?
Right now, the `lime` color scheme from windicss is used that does not
really fit the primary color used for the documentation website. I have
used the primary color `#4CAF50` from the docs and created a color
palette with https://palettte.app/:

<details>
  <summary>JSON source</summary>

```Json
[
  {
    "paletteName": "New Palette",
    "swatches": [
      {
        "name": "New Swatch",
        "color": "166E30"
      },
      {
        "name": "New Swatch",
        "color": "248438"
      },
      {
        "name": "New Swatch",
        "color": "369943"
      },
      {
        "name": "New Swatch",
        "color": "4CAF50"
      },
      {
        "name": "New Swatch",
        "color": "68C464"
      },
      {
        "name": "New Swatch",
        "color": "8AD97F"
      }
    ]
  }
]
```

</details>


![image](https://github.com/woodpecker-ci/woodpecker/assets/3391958/a254f1e0-ce17-43a9-9e8b-72252296fd6f)

I have added this color scheme to the windicss config and replaced the
use of `lime` in the UI. While `woodpecker-300` would be the primary
color that is used for the docs, I currently use `woodpecke-400` as
primary color for the UI to fix some contrast issues.


![image](https://github.com/woodpecker-ci/woodpecker/assets/3391958/7bf751e1-f2a6-481c-bee7-a27d27cf8adb)

![image](https://github.com/woodpecker-ci/woodpecker/assets/3391958/e5673dc7-81c1-4fd4-bef9-14494bc5aa27)

What do you think? If you would like to stay with the current colors,
that's fine for me, I can just use the custom CSS feature in this case.

---------

Co-authored-by: 6543 <6543@obermui.de>

web/package.json

@@ -57,6 +57,7 @@
     "eslint-plugin-vue": "^9.15.1",
     "eslint-plugin-vue-scoped-css": "^2.5.0",
     "prettier": "^2.8.8",
+    "tinycolor2": "^1.6.0",
     "typescript": "5.0.3",
     "unplugin-icons": "^0.16.3",
     "unplugin-vue-components": "^0.24.1",