Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/hash-base64.md

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+# hash base64
+base64 encode or decode a value
+
+## Usage
+```shell
+> hash base64 ...args {flags} 
+ ```
+
+## Parameters
+* ...args: optionally base64 encode / decode data by column paths
+
+## Flags
+* -h, --help: Display this help message
+* -c, --character_set <string>: specify the character rules for encoding the input.
+Valid values are 'standard', 'standard-no-padding', 'url-safe', 'url-safe-no-padding','binhex', 'bcrypt', 'crypt'
+* -e, --encode: encode the input as base64. This is the default behavior if not specified.
+* -d, --decode: decode the input from base64
+
+## Examples
+  Base64 encode a string with default settings
+```shell
+> echo 'username:password' | hash base64
+ ```
+
+  Base64 encode a string with the binhex character set
+```shell
+> echo 'username:password' | hash base64 --character_set binhex --encode
+ ```
+
+  Base64 decode a value
+```shell
+> echo 'dXNlcm5hbWU6cGFzc3dvcmQ=' | hash base64 --decode
+ ```
+