Add "Web" to Element and SchildiChat web application (#3755)

* Replace "Element" with "Element Web"

- If Element indicates the web application, then it is changed to Element Web.
- If it indicates clients branded with Element such as Element desktop, web, mobile clients, then it is changed to Element clients.
- If it is combined with location sharing functionality, it is not changed.

with other some changes, including:

- Change "app.element.io" anchor link to "https://github.com/element-hq/element-web" on README.md, following other documentation files

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Replace "SchildiChat" with "SchildiChat Web"

- If SchildiChat indicates the web application, then it is changed to SchildiChat Web.
- If it indicates clients branded with SchildiChat such as SchildiChat desktop, web, mobile clients, then it is changed to SchildiChat clients.
- If it is combined with location sharing functionality, it is not changed.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Rename configuring-playbook-client-schildichat.md to configuring-playbook-client-schildichat-web.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

* Rename configuring-playbook-client-element.md to configuring-playbook-client-element-web.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

---------

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
Co-authored-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

examples/reverse-proxies/nginx/README.md

@@ -14,4 +14,4 @@ Copy the [matrix.conf](matrix.conf) file to your nginx server's filesystem, modi
 
 This configuration **disables SSL certificate retrieval**, so you will **need to obtain SSL certificates manually** (e.g. by using [certbot](https://certbot.eff.org/)) and set the appropriate path in `matrix.conf`. In the example nginx configuration, a single certificate is used for all subdomains (`matrix.example.com`, `element.example.com`, etc.). For your setup, may wish to change this and use separate `server` blocks and separate certificate files for each host.
 
-Also note that your copy of the `matrix.conf` file has to be adapted to whatever services you are using. For example, remove `element.example.com` from the `server_name` list if you don't use [Element](../../../docs/configuring-playbook-client-element.md) web client or add `dimension.example.com` to it if you do use the [Dimension](../../../docs/configuring-playbook-dimension.md) integration manager.
+Also note that your copy of the `matrix.conf` file has to be adapted to whatever services you are using. For example, remove `element.example.com` from the `server_name` list if you don't use [Element Web](../../../docs/configuring-playbook-client-element-web.md) client or add `dimension.example.com` to it if you do use the [Dimension](../../../docs/configuring-playbook-dimension.md) integration manager.