Fix typo

Update hardcoded upgrade tool to 23.3.31 (vaadin#3110)

Co-authored-by: Zhe Sun <31067185+ZheSun88@users.noreply.github.com>

Update hardcoded upgrade tool to 14.11.1 (vaadin#3107)

Update hardcoded vaadin version to 14.11.1 (vaadin#3106)

Co-authored-by: Zhe Sun <31067185+ZheSun88@users.noreply.github.com>

Add AppSec Kit documentation for V14 (vaadin#2985)

* Add appsec kit docs to the tools

* Add ui screenshots

* Update and improve content

* Update section titles

* Add button description

* First full pass at editing.

* Second pass at editing.

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Co-authored-by: Russell JT Dyer <russelljtdyer@users.noreply.github.com>

docs: swap logout instructions (vaadin#3092)

Invalidating the session before accessing UI.getCurrent() may cause
null pointer exceptions on some servlet container (for example Tomcat).

Fixes vaadin/flow#18284

Add chart examples (vaadin#2826)

* Examples for Column and Bar charts

* Examples for Area charts

* Examples for Line and Spiine charts

* Example for Error Bar chart

* Example for BoxPlot chart

* Example for Scatter chart

* Example for Bubble chart

* Example for Bullet and Organization chart

* Example for Pie, Gauge and Solid Gauge charts

* Example for Area Range chart. Adds examples for Area and Column Range section

* Example for Polar chart

* Adds multiple ChartTypes examples

* Small improvement in Bubble chart example

* Adds Area Spline Range example

* Fixes TreeMap colors

Co-authored-by: Bruno Rezende <brunovianarezende@gmail.com>

Update hardcoded upgrade tool to 14.11.0 (vaadin#3083)

Update vaadin version to 14.10.12 (vaadin#3063)

Co-authored-by: Zhe Sun <31067185+ZheSun88@users.noreply.github.com>

Add a page for Collaboration Kit serialization support (vaadin#2995)