build initial crawler script

[corb1999]

finish building the script that does the following:

• makes a list of urls to crawl, each url another page. use purr to generate the list
• do an initial page read, then calculate how many total pages need to be read
• write a function to read the html, then parse it into a tidy dataframe and include a Sys.sleep() to not spam
• minor cleaning on the pages then compiling them all into one dataframe
• append a time stamp to the result then export to a dropzone