remove pys-on* and py-on* attributes (#1361)

* remove pys-on* and py-on* attributes

* update changelog

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fix eslint

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/changelog.md

@@ -77,3 +77,4 @@ Deprecations and Removals
 - The py-config `runtimes` to specify an interpreter has been deprecated. The `interpreters` config should be used instead. ([#1082](https://github.com/pyscript/pyscript/pull/1082))
 - The attributes `pys-onClick` and `pys-onKeyDown` have been deprecated, but the warning was only shown in the console. An alert banner will now be shown on the page if the attributes are used. They will be removed in the next release. ([#1084](https://github.com/pyscript/pyscript/pull/1084))
 - The pyscript elements `py-button`, `py-inputbox`, `py-box` and `py-title` have now completed their deprecation cycle and have been removed. ([#1084](https://github.com/pyscript/pyscript/pull/1084))
+- The attributes `pys-onClick` and `pys-onKeyDown` have been removed. Use `py-click` and `py-keydown` instead ([#1361](https://github.com/pyscript/pyscript/pull/1361))

docs/reference/API/attr_to_event.md

@@ -5,15 +5,13 @@ PyScript provides a convenient syntax for mapping JavaScript events to PyScript
 For example, you can use the following code to connect the click event to a button:
 
 ```
-<button id="py-click" py-onClick="foo()">Click me</button>
+<button id="py-click" py-click="foo()">Click me</button>
 ```
 
 Here is a list of all the available event mappings:
 
 | PyScript Event Name | DOM Event Name |
 |-------------------|----------------|
-| py-onClick        | click          |
-| py-onKeyDown      | keydown        |
 | py-afterprint     | afterprint     |
 | py-beforeprint    | beforeprint    |
 | py-beforeunload   | beforeunload   |

docs/reference/API/display.md

@@ -35,7 +35,7 @@ Display will throw an exception if the target is not clear. E.g. the following c
         # from event handlers
         display('hello')
 </py-script>
-<button id="my-button" py-onClick="display_hello()">Click me</button>
+<button id="my-button" py-click="display_hello()">Click me</button>
 ```
 
 Because it's considered unclear if the `hello` string should be displayed underneath the `<py-script>` tag or the `<button>` tag.
@@ -49,7 +49,7 @@ To write compliant code, make sure to specify the target using the `target` para
         display('hello', target="helloDiv")
 </py-script>
 <div id="helloDiv"></div>
-<button id="my-button" py-onClick="display_hello()">Click me</button>
+<button id="my-button" py-click="display_hello()">Click me</button>
 ```
 
 #### Using matplotlib with display