Update Instructions to Install Chart from source (#15868)
Update Instructions to Install Chart from source (#15868)

The INSTALL file should contain details to run chart from source not other repo. This PR fixes it for Helm Chart Release.
sekikn/incubator-airflow,danielvdende/incubator-airflow,mistercrunch/airflow,apache/incubator-airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,apache/airflow,bolkedebruin/airflow,lyft/incubator-airflow,apache/airflow,nathanielvarona/airflow,apache/airflow,apache/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,bolkedebruin/airflow,cfei18/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,mistercrunch/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,dhuang/incubator-airflow,dhuang/incubator-airflow,dhuang/incubator-airflow,apache/airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,apache/incubator-airflow,apache/airflow,lyft/incubator-airflow,dhuang/incubator-airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,bolkedebruin/airflow,cfei18/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow