docs(silverbullet): Added new README for silverbullet role

roles/silverbullet_server/README.md

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+# Role: SilverBullet Server
+Sets up and deploys SilverBullet container
+For more information about SilverBullet check out [their website](https://silverbullet.md/)
+
+## Tags
+- silverbullet
+- docs
+
+## Required Variables
+Below is an annotated breakdown of the required variables and their structure for this role
+
+> [!WARNING]
+> Any variable marked `# !SENSITIVE` **should not** be stored in plain text under any circumstance
+
+### SilverBullet Info
+Defines settings for the SilverBullet Server.
+Most of these variables are optional, and have predefined defaults in the role itself, however it is possible to define custom variables in `host_vars` files.
+Any variable marked as optional has a default value defined in `defaults/main.yaml` for this role
+
+```yaml
+# (optional): Name of the silverbullet container
+# This name is also the name of the service created by the quadlet file, 
+# as well as the name of the .container file
+# default: silverbullet
+# format: snake_case
+silverbullet_name:
+
+# (optional): Image of the silverbullet container
+# This can be any image from any register that podman supports
+# default: ghcr.io/silverbulletmd/silverbullet:latest
+# format: URL
+silverbullet_image:
+
+# (optional): Port of the silverbullet webui
+# this is used for traefik labels to allow for access to the webui
+# the default value is defined by the silverbullet container itself. For information on changing it, view the documentation for your image
+# default: 3000
+# format: int
+silverbullet_port:
+
+# (optional): Username of the silverbullet user
+# this is the default user created for silverbullet
+# note, this value has a default, but it is highly recommended to change it via `host_vars`
+# default: jdelpilar
+# format: username
+silverbullet_user:
+
+# (optional): password for the above created user
+# note, this value has a default, but it is highly recommended to change it via `host_vars`
+# !SENSITIVE
+# default: generated password
+# format: password
+silverbullet_pass:
+
+# (optional): url of the silverbullet instance
+# this is used to set the url in traefik
+# default: silverbullet.delpilar.net
+# format: url
+silverbullet_url:
+```
+
+## Templates
+
+### silverbullet.container.j2
+This template creates a `.container` file for silverbullet
+By default this template supports the following additional variables not listed above.
+- silver_bullet_volumes: used to define additional mounted volumes
+  - format: <host_path>:<container_path>
+- silver_bullet_env: used to define additional environment variables used by the container
+  - format: dict(<key>:<value>)
+
+## Execution
+> [!NOTE]
+> This role restarts any containers where the `.container` file is changed. As such, please ensure that all work is saved and all users are made aware of any potential downtime.
+
+To run this role without running any other roles, please use this command
+```bash
+ansible-playbook site.yaml --tags silverbullet
+```
+
+To run all roles with the `docs` tag at once, please use this command
+```bash
+ansible-playbook site.yaml --tags docs
+```