feat(error): Server error handler (DSP-710) (#355)

* chore: Update package-lock.json

* chore(error): Add fake error page (easteregg)

* feat(error): Clean up error component

* style(error): New (and renamed) error status images

* feat(error): Error handler to switch between error notifications

* chore(error): Use new error handler

* refactor(error): Add new errorhandler everywhere

* test(error): Fix tests to use new error handler

* test(error): Fix tests to use new error handler

* fix: Increase maximum budget for initial-es5

* chore: fix pr template

* refactor(style): delete commented line

* chore(error): Update error messages

* test(error): Add missing modules

Co-authored-by: Marcin Procyk <marcin.procyk@dasch.swiss>

.github/pull_request_template.md

@@ -1,4 +1,4 @@
 ===REMOVE===
-Important! Please follow the new guideline for setting the Pull Request title: https://docs.dasch.swiss/developers/dsp/contribution/#pull-request-guidelines
+Important! Please follow the new guidelines for naming Pull Requests: https://docs.dasch.swiss/developers/dsp/contribution/#pull-request-guidelines
 ===REMOVE===
 resolves DSP-

angular.json

@@ -58,8 +58,8 @@
                             "budgets": [
                                 {
                                     "type": "initial",
-                                    "maximumWarning": "7mb",
-                                    "maximumError": "7mb"
+                                    "maximumWarning": "8mb",
+                                    "maximumError": "8mb"
                                 },
                                 {
                                     "type": "anyComponentStyle",