As @xxavier notes, there's a large gap between existing and internet-accessible documentation. It seems likely that over time, more and more Apollo-era documentation will be digitized in order to reduce warehousing costs.
A vast amount of digitized material -- hundreds of thousands of documents -- is available on NASA's Technical Report Server. The best way to find it is with a google search for key words using
site:ntrs.nasa.gov to filter out other sources. NTRS has its own search facility, but it's not of much use unless you know a lot about a specific document you're looking for.
Specifications & Component Level Data
I haven't seen much of this. You might have some luck searching for the name of a particular subsystem plus "specification", but I see a lot more "experience reports" which mention specifications than the specifications themselves.
I haven't found anything at all on the level of "this thing is held together with #8 bolts", probably because those details are proprietary to the private companies that built the stages and spacecraft. This material is in more danger of being lost, because it's held by for-profit organizations but has only historical value.
You can find information at the level of an electrical schematic for the Block II IMU Temperature Control Subsystem.
Adding the name of the contractor company might get you a little deeper. If you're having trouble sleeping, I recommend something like North American Rockwell's "Apollo Command and Service Module Stabilization and Control System Design Survey".
As launch of any major rocket is a complex choreographed operation involving hundreds of people, there's nothing like a single document with the launch instructions. Googling
saturn v launch manual yields documents like this one for Apollo 8 (SA-503), but it's necessarily kind of a sketchy overview. While ostensibly intended as an orientation for the astronaut crews, it contains things of questionable value to that audience, such as detailed diagrams of the actuators for the F-1 engine gimbals.
Some of this has been digitized; a quick Googling turned up a doozy, Apollo 15 PLSS Telemetry: raw images of strip charts of data from the portable life support backpacks showing things like suit pressure, battery performance, sublimator gas outlet temperature, etc. over the course of each EVA.
Incident Reports/Mission Evaluations
apollo # mission report. As an example, the mission report for Apollo 15 is 238 pages and includes among other details a table of each propulsive maneuver performed on the flight, results of scientific experiments, and dozens of minor equipment problems from "loose object in cabin fans" (a quarter-inch washer) to "difficult to obtain water from in-suit drinking device".