Renaming the original Kamen Rider series

Posted under Tags

BUR #12339 has been approved by @nonamethanks.

rename kamen_rider_(series) -> kamen_rider_(1st_series)
create implication kamen_rider_(1st_series) -> kamen_rider

Kamen Rider (series) as a tag for the first series is very potentially ambiguous with Kamen Rider as the franchise umbrella tag. Giving it a _(1st_series) qualifier in the vein of Ultraman (1st series) and Getter Robo (1st series), and implicating it to the franchise tag.