development: update links to Jinja2

source/development/architecture.rst

@@ -126,7 +126,7 @@ Currently there are four types of services implemented in the daemon:
 -  inline : perform inline actions which are part of configd, most notable template generation and maintanance.
 
 |
-| Template generation is handled by Jinja2 (http://jinja.pocoo.org/),
+| Template generation is handled by Jinja2 (https://jinja.palletsprojects.com/en/stable/),
   more information on how to create application templates can be found
   at :doc:`/development/backend/templates`.
 

source/development/backend/templates.rst

@@ -8,7 +8,7 @@ General
 
 For config file generation, we provide a backend service which can bind
 config.xml data to templates written in Jinja2
-(http://jinja.pocoo.org/docs/dev/).
+(https://jinja.palletsprojects.com/en/stable/).
 
 All available templates should be installed at the following location on
 the OPNsense system:
@@ -89,7 +89,7 @@ Templates
 ---------
 
 For more information of the template language itself, please look at
-http://jinja.pocoo.org/docs/dev/ and the examples installed in
+https://jinja.palletsprojects.com/en/stable/ and the examples installed in
 /usr/local/opnsense/service/templates/OPNsense/Sample.
 
 There's one special case when using the template engine, every wildcard

source/development/examples/helloworld.rst

@@ -973,7 +973,7 @@ prefixed with os-, our new package file will be called:
 -  frontend template language reference (Volt) :
    https://docs.phalcon.io/latest/volt/
 -  configuration template language reference (mostly the same as Volt) :
-   http://jinja.pocoo.org/docs/dev/
+   https://jinja.palletsprojects.com/en/stable/
 -  OPNsense architecture :doc:`Architecture <../architecture>`
 -  OPNsense creating models
    `Develop:Frontend/Creating\_models </index.php/Develop:Frontend/Creating_models>`__