Add log and dns documentation

docs/configuration/dns/index.md

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+### Structure
+
+```json
+{
+  "dns": {
+    "servers": [],
+    "rules": [],
+    "final": "",
+    "strategy": "prefer_ipv6",
+    "disable_cache": false,
+    "disable_expire": false
+  }
+}
+
+```
+
+### Fields
+
+| Key      | Format                         |
+|----------|--------------------------------|
+| `server` | List of [DNS Server](./server) |
+| `rules`  | List of [DNS Rule](./rule)     |
+
+#### final
+
+Default dns server tag, the first one will be used if it is empty.
+
+#### strategy
+
+Default domain strategy for resolving the domain names.
+
+One of `prefer_ipv4` `prefer_ipv6` `ipv4_only` `ipv6_only`.
+
+#### disable_cache
+
+Disable dns cache.
+
+#### disable_expire
+
+Disable dns cache expire.

docs/configuration/dns/rule.md

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+### Structure
+
+```json
+{
+  "dns": {
+    "rules": [
+      {
+        "inbound": [
+          "mixed-in"
+        ],
+        "network": "tcp",
+        "protocol": [
+          "tls",
+          "http",
+          "quic"
+        ],
+        "domain": [
+          "test.com"
+        ],
+        "domain_suffix": [
+          ".cn"
+        ],
+        "domain_keyword": [
+          "test"
+        ],
+        "domain_regex": [
+          "^stun\\..+"
+        ],
+        "geosite": [
+          "cn"
+        ],
+        "source_geoip": [
+          "private"
+        ],
+        "source_ip_cidr": [
+          "10.0.0.0/24"
+        ],
+        "source_port": [
+          12345
+        ],
+        "port": [
+          80,
+          443
+        ],
+        "outbound": [
+          "direct"
+        ],
+        "server": "local"
+      },
+      {
+        "type": "logical",
+        "mode": "and",
+        "rules": [],
+        "server": "local"
+      }
+    ]
+  }
+}
+
+```
+
+!!! note ""
+
+    You can ignore the JSON Array [] tag when the content is only one item
+
+### Default Fields
+
+!!! note ""
+
+    The default rule uses the following matching logic:  
+    (`domain` || `domain_suffix` || `domain_keyword` || `domain_regex` || `geosite`) &&  
+    (`source_geoip` || `source_ip_cidr`) &&  
+    `other fields`  
+
+#### inbound
+
+Tags of [inbound](../inbound).
+
+#### network
+
+`tcp` or `udp`.
+
+#### domain
+
+Match full domain.
+
+#### domain_suffix
+
+Match domain suffix.
+
+#### domain_keyword
+
+Match domain using keyword.
+
+#### domain_regex
+
+Match domain using regular expression.
+
+#### geosite
+
+Match geosite.
+
+#### source_geoip
+
+Match source geoip.
+
+#### source_ip_cidr
+
+Match source ip cidr.
+
+#### source_port
+
+Match source port.
+
+#### port
+
+Match port.
+
+#### outbound
+
+Match outbound.
+
+#### server
+
+Tag of the target dns server.
+
+### Logical Fields
+
+#### type
+
+`logical`
+
+#### mode
+
+`and` or `or`
+
+#### rules
+
+Included default rules.
+
+#### server
+
+Tag of the target dns server.

docs/configuration/dns/server.md

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+### Structure
+
+```json
+{
+  "dns": {
+    "servers": [
+      {
+        "tag": "google",
+        "address": "tls://dns.google",
+        "address_resolver": "local",
+        "address_strategy": "prefer_ipv4",
+        "detour": "direct"
+      }
+    ]
+  }
+}
+
+```
+
+### Fields
+
+#### tag
+
+The tag of the dns server.
+
+#### address
+
+The address of the dns server.
+
+| Protocol | Format                      |
+|----------|-----------------------------|
+| `System` | `local`                     |
+| `TCP`    | `tcp://1.0.0.1`             |
+| `UDP`    | `8.8.8.8` `udp://8.8.4.4`   |
+| `TLS`    | `tls://dns.google`          |
+| `HTTPS`  | `https://1.1.1.1/dns-query` |
+
+!!! warning ""
+
+    To ensure that system DNS is in effect, rather than go's built-in default resolver, enable CGO at compile time.
+
+#### address_resolver
+
+Tag of a another server to resolve the domain name in the address.
+
+#### address_strategy
+
+The domain strategy for resolving the domain name in the address.
+
+One of `prefer_ipv4` `prefer_ipv6` `ipv4_only` `ipv6_only`.
+
+`dns.strategy` will be used if `address_strategy` is empty.
+
+#### detour
+
+Tag of an outbound for connecting to the dns server.
+
+Requests will be sent directly if the empty.