No Generator class - Githubissues

Will close #397

Not sure if this should be merged. See "Should this be merged?" section

What's in this pr

Removes generator class instantiation
Moves generator functions out of their own separate files and into their subject files
- Removed func/<subject> directories and put generator functions in <subject>.py
ids are stored in ids.txt
- Genlist is generated from this list
Added documentation created with pdoc

Uses pdoc html instead of large github table
- Github table currently takes a long time to load but may be easier to look at
- Could do an entire other pros/cons of github readme vs pdocs
More conventional library structure?
Contributors don't have to manually determine id
- Could just add the ids.txt file to current version to have this pro without the rest

Many generator functions in each subject file
- May be difficult to find a function
- Would be easier to add nested subjects if each function is placed in nested subject folders instead of subject files.
Doesn't seem to offer significant speed improvements that were previously expected

More friendly for beginner devs?
Saves a click, may be better for retention or to show what is possible
- Could add a gif that shows the wide variety of problems that can be created
- Quickly shuffle through frames showing a randomly generated problem
May be more difficult to generate sample problems for pdoc
Pdoc over github
Better layout, easier to nest subjects
Better documentation and explanation for each function
Don't have to wait for all of the mathjax to render in gh readme
- could just make multiple subject readmes, but I think i would prefer pdoc over nabigating many gh readmes

[x] Add underscores to non-generator methods that should not be included in documentation
- Do the same for private modules (buildlatex.py, etc)
[x] Create getGenList method doing exactly the same thing as before
[x] Delete old readme generator table
- [x] Add example problems to documentation
[x] #406