CLIMATE-533 Revisit mccsearch README making updates as required

Hi Folks,
OK, the following pull request
 * Updates the mccsearch documentation to be more representative of current state of codebase. I will most likely be adding to it based on how the issues tagged with mcc search progress within Jira.
 * removes the unnecessary .docx file... all of the content within this was moved to mccsearch/docs/mccsearch.md anyway.
Thanks
Lewis