manual: add 'Plot: Lines' page stub

Plot: Lines

============

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#### Example:

    plot {

      series {

        type: lines;

        xs: 10   20   30   40   50   60    70   80  90  100;

        ys: 1.23 4.32 3.23 6.43 3.45 11.32 8.14 5.2 3.5 2.2;

      }

    }

#### Properties:

<table>

  <tbody>

    <tr>

      <td><code><strong>type</strong></code></td>

      <td>'lines'</td>

    </tr>

    <tr>

      <td><code><strong>xs</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>ys</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>colour</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>line-width</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>line-colour</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>point-size</strong></code></td>

      <td>Here be dragons</td>

    </tr>

    <tr>

      <td><code><strong>point-colour</strong></code></td>

      <td>Here be dragons</td>

    </tr>

  </tbody>

</table>

## Settings

### xs

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    xs: <data>;

--

### ys

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    ys: <data>;

--

### colour

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    colour: <size>;

Values:

  - `#fff`

  - `#ffffff`

--

### line-width

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    line-width: <size>;

Values:

  - `1px`

  - `5pt`

--

### line-colour

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    line-colour: <size>;

Values:

  - `#fff`

  - `#ffffff`

--

### point-size

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    point-width: <size>;

Values:

  - `1px`

  - `5pt`

--

### point-colour

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    point-colour: <size>;

Values:

  - `#fff`

  - `#ffffff`

## Examples

<a href="/examples/linecharts/simple_lines"><img src="/examples/linecharts/simple_lines/simple_lines.png" style="width: 100%;" /></a>

    pages:

      -

        title: "Plot: Domains"

        url: "/documentation/plot-lines"

        url: "/documentation/plot-domains"

        file: "metric_queryd"

      -

        title: "Plot: Axes"

        url: "/documentation/plot-lines"

        url: "/documentation/plot-axes"

        file: "metric_queryd"

      -

        title: "Plot: Gridlines"

        url: "/documentation/plot-lines"

        url: "/documentation/plot-gridlines"

        file: "metric_queryd"

      -

        title: "Plot: Lines"

        url: "/documentation/plot-lines"

        file: "metric_queryd"

        file: "plot_lines"

      -

        title: "Plot: Scatter"

        url: "/documentation/plot-lines"

        url: "/documentation/plot-scatter"

        file: "metric_queryd"

      -

        title: "Plot: Areas"

        url: "/documentation/plot-lines"

        url: "/documentation/plot-areas"

        file: "metric_queryd"

      -

        title: "Plot: Bars"

        url: "/documentation/plot-lines"

        url: "/documentation/plot-bars"

        file: "metric_queryd"

  -