Adds a subsection on reporting bugs in the websites managed by the R-Core team

[razekmh]

At RSECon24 R dev day.

This resolves one part of #117

Changes made: I have added a section 4.5.3 for the list of websites (R FAQ, Windows FAQ, Mac FAQ, R project web-site, CRAN website).

Not done: Also mentioned in #117 is adding a new section for additional resources.