add docs for db and redis

src/content/docs/processors/db/query.md

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+---
+title: Query
+sidebar:
+    order: 1
+---
+The `db.query` processor will issue a query to the specified module and return the result to the next processor in line.
+
+- **type**: `db.query`
+- **params**:
+    - **module**: the id of the [module](/concepts/modules) to issue query to.
+    - **query**: the query to execute. 
+### Example
+Issue a `SELECT` statement to a module with id `sqlite`.
+```
+- type: db.query
+  params:
+    module: sqlite
+    query: "SELECT * from users;"
+```

src/content/docs/processors/kv/get.md

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+---
+title: Get
+sidebar:
+    order: 1
+---
+The `kv.get` processor gets the value associated with a key from a compatible module. The output payload is the value if the key is found.
+
+- **type**: `kv.get`
+- **params**:
+    - **module**: id of the module
+    - **key**: the key to look up
+
+### Example
+This will attempt to get the value for the `counter` key from the module with an id of `redis`
+```
+- type: kv.get
+  params:
+    module: redis
+    key: counter
+```

src/content/docs/processors/kv/set.md

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+---
+title: Set
+sidebar:
+    order: 2
+---
+The `kv.set` processor sets the value associated with a key from a compatible module. The payload is unchanged so whatever is received by this payload is output unless any errors are encountered.
+
+- **type**: `kv.set`
+- **params**:
+    - **module**: id of the module
+    - **key**: the key to look up
+    - **value**: the value to set
+
+### Example
+This will attempt to set the key `hello` to `world` using the module with an id of `redis`
+```
+- type: kv.set
+  params:
+    module: redis
+    key: hello
+    value: world
+```