Add Configuration page

Configuration.md

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+# Configuration
+
+Echo reads a single TOML file. Pass its path as the first argument (default `config.toml`). Copy `config.example.toml` to start. `config.toml` is gitignored because it holds the link password.
+
+## [uplink] (required)
+
+The ircd Echo links to. `password` must match the `<link>` block on the uplink.
+
+    [uplink]
+    host = "127.0.0.1"
+    port = 7000
+    password = "changeme"
+
+## [server] (required)
+
+Echo's own identity on the network. `sid` is three characters, unique on the network. `protocol` is the InspIRCd link version (1206 for insp4, 1205 for insp3).
+
+    [server]
+    name = "services.example.net"
+    sid = "42S"
+    description = "Federated Services"
+    protocol = 1206
+
+## [gossip], [gossip.tls], [[peer]]
+
+Node-to-node replication. Omit all three to run a single node. See [Federation](Federation).
+
+    [gossip]
+    bind = "0.0.0.0:16700"
+    secret = "shared-secret"
+
+    [gossip.tls]              # omit for a plaintext link
+    cert = "certs/node.crt"
+    key  = "certs/node.key"
+    ca   = "certs/ca.crt"     # a peer must present a cert signed by this CA
+
+    [[peer]]                  # one block per other node
+    addr = "other-node:16700"
+    name = "other-node"       # TLS name to expect; matches the peer certificate
+
+Generate certificates with `scripts/gen-certs.sh`.
+
+## [grpc], [grpc.tls]
+
+The account and channel directory over gRPC, for a website to mirror. Omit to disable. See [Directory API](Directory-API).
+
+    [grpc]
+    bind = "127.0.0.1:50051"
+    token = "shared-secret"   # every RPC sends `authorization: Bearer <token>`
+
+## [modules]
+
+Which services start. Omit for the full standard suite. List names to run a subset; add `"example"` for the template service.
+
+    [modules]
+    services = ["nickserv", "chanserv"]
+
+## [[oper]]
+
+Services operators and their privileges: `auspex` (see hidden info), `suspend` (suspend/unsuspend), `admin` (modify or drop others' accounts and channels).
+
+    [[oper]]
+    account = "yournick"
+    privs = ["auspex", "suspend", "admin"]
+
+## [log]
+
+An audit channel for the incident feed. Notable actions are announced there; private material and cosmetic self-service tweaks are not.
+
+    [log]
+    channel = "#services"
+
+## [expire]
+
+Inactivity expiry. Accounts not identified to, and channels not joined, past the threshold are dropped on a periodic pass. Opers, live sessions, occupied channels, and NOEXPIRE records are spared. A zero or omitted field leaves that kind never expiring.
+
+    [expire]
+    accounts_days = 90
+    channels_days = 30
+    warn_days = 7             # heads-up email this many days before expiry
+
+## [session]
+
+Per-IP session limiting. The connection that puts an IP over the limit is killed on connect; OperServ exceptions adjust it per mask.
+
+    [session]
+    default_limit = 3
+
+## [auth]
+
+Account authority. Omitted, Echo owns accounts itself. With `external = true`, identity is handed to an outside authority (for example a website): IRC can only IDENTIFY, and the authority pushes accounts in via the gRPC Accounts API. Echo still owns channel, vhost, and ban data.
+
+    [auth]
+    external = true
+
+## [email]
+
+Outbound email for registration confirmation and password recovery. Omit to run without email. `command` is a shell command fed the message on stdin (`msmtp -t`, `sendmail -t`, or a relay script).
+
+    [email]
+    command = "msmtp -t"
+    from = "noreply@example.net"
+    brand = "Example Network"