feat: Replaced epydoc with pydoctor

[Evolancer02]

I, @mljoshi, and @Michael-Kowata have worked on replacing the API documentation tool epydoc with pydoctor, addressing the issue #1364.

Changes that were made:

• Removed the docs/epy folder and the old HTML files inside the folder that were generated with epydoc
• Created a new folder called pydoc and regenerated the appropriate HTML files with pydoctor inside the folder
• Updated the associated links in some of the markdown files
• Updated the command for the generation of the HTML files in the build.sh file

Files that were updated:

• docs/README.md
• docs/batch.md
• docs/build
• docs/media.md
• docs/mocks.md
• docs/start.md

[mljoshi]

Also fixes #2300.

[utsab]

@tristanlatr or @vchudnov-g -- Is it possible for you to take a look at this PR sometime this week? The authors of this PR are students at the Computing Talent Initiative (CTI), and they are presenting their work this Friday. It would be nice if this PR were to get approved by then or at least give them some feedback which they can talk about during their presentation. Thank you.