Re-levelization: move non-docs content, rename content→docs

For better URLs, the content folder has been renamed 'docs' and all
other files have been moved up a level. Also, non-docs images have been
moved to the static folder at the top level where they belong.

Many relative paths had to be fixed to make this work.

docs/references/http-websocket-apis/public-api-methods/server-info-methods/fee.md

@@ -167,4 +167,4 @@ The response follows the [standard format][], with a successful result containin
 
 - Any of the [universal error types][].
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/server-info-methods/manifest.md

@@ -150,4 +150,4 @@ If provided, the `details` object contains the following fields:
 - `invalidParams` - The `public_key` field was missing or specified incorrectly.
 - `reportingUnsupported` - ([Reporting Mode][] servers only) This method is not available in Reporting Mode.
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/server-info-methods/server_definitions.md

@@ -102,4 +102,4 @@ To see a full `definitions.json` file and descriptions of the top-level fields,
 
 Any of the [universal error types][].
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/server-info-methods/server_info.md

@@ -122,12 +122,12 @@ The `info` object may have some arrangement of the following fields:
 
 **Note:** If the `closed_ledger` field is present and has a small `seq` value (less than 8 digits), that indicates `rippled` does not currently have a copy of the validated ledger from the peer-to-peer network. This could mean your server is still syncing. Typically, it takes about 5 minutes to sync with the network, depending on your connection speed and hardware specs.
 
-{% partial file="/_snippets/etl-source-object.md" /%}
+{% partial file="/docs/_snippets/etl-source-object.md" /%}
 
-{% partial file="/_snippets/port-descriptor-object.md" /%}
+{% partial file="/docs/_snippets/port-descriptor-object.md" /%}
 
 ## Possible Errors
 
 * Any of the [universal error types][].
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/server-info-methods/server_state.md

@@ -318,12 +318,12 @@ The `state` object may have some arrangement of the following fields:
 
 [Reporting mode]: ../../../../concepts/networks-and-servers/rippled-server-modes.md
 
-{% partial file="/_snippets/etl-source-object.md" /%}
+{% partial file="/docs/_snippets/etl-source-object.md" /%}
 
-{% partial file="/_snippets/port-descriptor-object.md" /%}
+{% partial file="/docs/_snippets/port-descriptor-object.md" /%}
 
 ## Possible Errors
 
 * Any of the [universal error types][].
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}