button component and time series plots

 - Better support for time series in the [chart](https://sql.ophir.dev/documentation.sql?component=chart#component) component. You can now use the `time` top-attribute to display a time series chart
 with smart x-axis labels.
 - **New component**: [button](https://sql.ophir.dev/documentation.sql?component=button#component). This allows you to create rows of buttons that allow navigation between pages.
 - Better error messages for Microsoft SQL Server. SQLPage now displays the line number of the error, which is especially useful for debugging long migration scripts.
 - Many improvements in the official website and the documentation.
    - Most notably, the documentation now has syntax highlighting on code blocks (using [prism](https://prismjs.com/) with a custom theme made for tabler). This also illustrates the usage of external javascript and css libraries in SQLPage. See [the shell component documentation](https://sql.ophir.dev/documentation.sql?component=shell#component).
    - Better display of example queries in the documentation, with smart indentation that makes it easier to read.
 - Clarify some ambiguous error messages:
   - make it clearer whether the error comes from SQLPage or from the database
   - specific tokenization errors are now displayed as such

v0.13.0: beatiful timelines and scatter plots

 - New [timeline](https://sql.ophir.dev/documentation.sql?component=timeline#component) component to display a timeline of events.
 - Add support for scatter and bubble plots in the chart component. See [the chart documentation](https://sql.ophir.dev/documentation.sql?component=chart#component).
 - further improve debuggability with more precise error messages. In particular, it usd to be hard to debug errors in long migration scripts, because the line number and position was not displayed. This is now fixed.
 - Better logs on 404 errors. SQLPage used to log a message without the path of the file that was not found. This made it hard to debug 404 errors. This is now fixed.
 - Add a new `top_image` attribute to the [card](https://sql.ophir.dev/documentation.sql?component=card#component) component to display an image at the top of the card. This makes it possible to create beautiful image galleries with SQLPage.
 - Updated dependencies, for bug fixes and performance improvements.
 - New icons (see https://tabler-icons.io/changelog)
 - When `NULL` is passed as an icon name, display no icon instead of raising an error.

variables, sqlpage.exec, better errors, on_connect.sql

Better error messages

new feature: sqlpage/on_connect.sql to run sql statements at the begi…

…nning of every new connection

Beta 2, fixes bugs with non-string variables and

introduces sqlpage.exec

v0.12 BETA: add support for variables

Security update. Fixes a potential exposure of database credentials i…

…f they are in the configuration file (not in an environment variable), and the web_root is the default (the current working directory). See sqlpage#89

new sqlpage functions, more configuration, better logging and user ha…

…nd-holding, new icons

new release files