Use a /webhook path for generic webhooks

By appending `/webhook` to the public URL (becoming `/hookshot/webhooks/webhook`)
and by only stripping the `/hookshot/webhooks` prefix,
we're effectively following what newer Hookshot versions advise
(see https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1681).

This change appears to be backward-compatible (old webhook URLs like `/hookshot/webhooks/:hookId` still work),
until Hookshot behavior changes.

docs/configuring-playbook-bridge-hookshot.md

@@ -50,7 +50,8 @@ Unless indicated otherwise, the following endpoints are reachable on your `matri
 
 | listener | default path | variable | used as |
 |---|---|---|---|
-| webhooks | `/hookshot/webhooks/` | `matrix_hookshot_webhook_endpoint` | generics, GitHub "Webhook URL", GitLab "URL", etc. |
+| - | `/hookshot/webhooks/` | `matrix_hookshot_webhook_endpoint` | Webhook-prefix, which affects all webhook-related URLs below |
+| generic | `/hookshot/webhooks/webhook` | `matrix_hookshot_generic_endpoint` | Generic webhooks |
 | github oauth | `/hookshot/webhooks/oauth` | `matrix_hookshot_github_oauth_endpoint` | GitHub "Callback URL" |
 | jira oauth | `/hookshot/webhooks/jira/oauth` | `matrix_hookshot_jira_oauth_endpoint` | JIRA OAuth |
 | figma endpoint | `/hookshot/webhooks/figma/webhook` | `matrix_hookshot_figma_endpoint` | Figma |

roles/custom/matrix-bridge-hookshot/defaults/main.yml

@@ -154,7 +154,7 @@ matrix_hookshot_jira_oauth_redirect_uri: "{{ matrix_hookshot_urlprefix }}{{ matr
 matrix_hookshot_generic_enabled: true
 matrix_hookshot_generic_enableHttpGet: false  # noqa var-naming
 # Default value of matrix_hookshot_generic_endpoint: "/hookshot/webhooks"
-matrix_hookshot_generic_endpoint: "{{ matrix_hookshot_webhook_endpoint }}"
+matrix_hookshot_generic_endpoint: "{{ matrix_hookshot_webhook_endpoint }}/webhook"
 # urlprefix gets updated with protocol & port in group_vars/matrix_servers
 matrix_hookshot_generic_urlPrefix: "{{ matrix_hookshot_urlprefix }}{{ matrix_hookshot_generic_endpoint }}"  # noqa var-naming
 # If you're also using matrix-appservice-webhooks, take care that these prefixes don't overlap