Phdseeker

-- output file renamed to `PhD_Positions_date[keywords].[csv/xlsx]`
-- 2 sample output files removed from the repo

-- fixed some issue with printing.
-- prints out the name of output files.
-- fixed the minimum version of python to 3.8 for PyPi because of using walrus operator

-- Bettter ouptut.

-- missing `openpyxl` as another dependency to write the output in the excel file

-- http3.client.AsyncClient --> close()
-- httpx._client.AsyncClient --> aclose()

-- close the open client of http3/x