Move docs to mkdocs and improve them

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docs/administration/CLI tasks/maintenance_ tasks.md

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+# Maintenance tasks
+
+## Installation
+
+Generates new configuration files.
+
+!!! warning
+    This command generates configuration for your Mobilizon instance and should be run only once when installing. 
+
+If any options are left unspecified, you will be prompted interactively.
+
+```bash
+mix mobilizon.instance gen [<options>]
+```
+
+### Options
+* `-f`, `--force` Whether to erase existing files
+* `-o`, `--output PATH` The path to output the `.env` file. Defaults to `.env.production`.
+* `--output_psql PATH` The path to output the SQL script. Defaults to `setup_db.psql`.
+* `--domain DOMAIN` The instance's domain
+* `--instance_name INSTANCE_NAME` The instance's name
+* `--admin_email ADMIN_EMAIL` The administrator's email
+* `--dbhost HOSTNAME` The database hostname of the PostgreSQL database to use
+* `--dbname DBNAME` The name of the database to use 
+* `--dbuser DBUSER` The database user (aka role) to use for the database connection 
+* `--dbpass DBPASS` The database user's password to use for the database connection 
+* `--dbport DBPORT` The database port
+
+## Depreciated commands
+
+### move_participant_stats
+
+Task to move participant stats directly on the `event` table (so there's no need to count event participants each time).
+This task should **only be run once** when migrating from `v1.0.0-beta.1` to `v1.0.0-beta.2`.
+
+This task will be removed in version `v1.0.0-beta.3`.
+
+```bash
+mix mobilizon.move_participant_stats
+```
+
+### setup_search
+
+Task to setup search for existing events.
+
+This task should **only be run once** when migrating from `v1.0.0-beta.1` to `v1.0.0-beta.2`.
+
+This task will be removed in version `v1.0.0-beta.3`.
+
+```bash
+mix mobilizon.setup_search
+```

docs/administration/CLI tasks/manage_users.md

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+# Manage users
+
+!!! bug
+    Not yet existing

docs/administration/CLI tasks/relay.md

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+# Relay
+
+Manages remote relays
+
+## Make your instance follow a mobilizon instance
+
+```bash
+mix mobilizon.relay follow <relay_url>
+```
+
+Example: 
+```bash
+mix mobilizon.relay follow https://example.org/relay
+```
+
+## Make your instance unfollow a mobilizon instance
+
+```bash
+mix mobilizon.relay unfollow <relay_url>
+```
+
+Example: 
+```bash
+mix mobilizon.relay unfollow https://example.org/relay
+```