Remove select docs (#6287)

Select API is sufficiently documented, this doc is also incomplete.

- https://aws.amazon.com/blogs/aws/s3-glacier-select/
- https://aws.amazon.com/blogs/developer/introducing-support-for-amazon-s3-select-in-the-aws-sdk-for-ruby/
- https://aws.amazon.com/blogs/developer/introducing-support-for-amazon-s3-select-in-the-aws-sdk-for-javascript/
- https://aws.amazon.com/blogs/developer/category/storage/s3-select/

docs/select/README.md

@@ -1,98 +0,0 @@
-# How to use Minio S3 Select [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io)
-
-This document explains current limitations of the Minio S3 Select support.
-
-## 1. Features to be implemented
-1). JSON documents as supported Objects
-
-2). CAST expression
-
-3). Date Functions
-
-4). Returning types other than float from aggregation queries.
-
-5). Bracket and Reversal Notation with SQL Like operator.
-
-6). SUBSTRING currently is not supported and TRIM only works with default arguments of trim leading and trailing spaces
-
-## 2. Sample Usage with AWS Boto Client
-```python
-import boto3
-from botocore.client import Config
-import os
-s3 = boto3.resource('s3',
-                    endpoint_url='ENDPOINT',
-                    aws_access_key_id='ACCESSKEY',
-                  aws_secret_access_key='SECRETKEY',
-                   config=Config(signature_version='s3v4'),
-                    region_name='us-east-1')
-s3_client = s3.meta.client
-
-r = s3_client.select_object_content(
-        Bucket='myBucket',
-        Key='myKey',
-        ExpressionType='SQL',
-        Expression = "SELECT * FROM S3OBJECT AS A",
-        InputSerialization = {'CSV': {"FieldDelimiter": ",","FileHeaderInfo":"USE"}},
-        OutputSerialization = {'CSV': {}},
-    )
-```  
-## 3. Sample Usage with Minio-Go Client
-
-```go
-	// Initialize minio client object.
-	minioClient, err := minio.New(endpoint, accessKeyID, secretAccessKey, useSSL)
-	if err != nil {
-		log.Fatalln(err)
-	}
-	input := minio.SelectObjectInput{
-		RecordDelimiter: "\n",
-		FieldDelimiter:  ",",
-		FileHeaderInfo:  minio.CSVFileHeaderInfoUse,
-	}
-	output := minio.SelectObjectOutput{
-		RecordDelimiter: "\n",
-		FieldDelimiter:  ",",
-	}
-	opts := minio.SelectObjectOptions{
-		Type:   minio.SelectObjectTypeCSV,
-		Input:  input,
-		Output: output,
-	}
-	myReader, err := minioClient.SelectObjectContent(ctx, "sqlselectapi", "player.csv", "Select * from S3OBJECT WHERE last_name = 'James'", opts)
-	if err != nil {
-		fmt.Println(err)
-		return
-	}
-	defer myReader.Close()
-
-	results, resultWriter := io.Pipe()
-	go func() {
-		defer resultWriter.Close()
-		for event := range myReader.Events() {
-			switch e := event.(type) {
-			case *minio.RecordEvent:
-				resultWriter.Write(e.Payload)
-			case *minio.ProgressEvent:
-				fmt.Println("Progress")
-			case *minio.StatEvent:
-				fmt.Println(string(e.Payload))
-			case *minio.EndEvent:
-				fmt.Println("Ended")
-				return
-			}
-		}
-	}()
-	resReader := csv.NewReader(results)
-	for {
-		record, err := resReader.Read()
-		if err == io.EOF {
-			break
-		}
-		// Print out the records
-		fmt.Println(record)
-	}
-	if err := myReader.Err(); err != nil {
-		fmt.Println(err)
-	}
-```