add `load_from_repo` function to toplevel function

Dependencies

• [2] 7FW5LLFA add command line interface
• [*] FHV5776V init record

Change contents

• edit in src/main.rs at line 26
  [2.420]

  [2.420]
  + if let Err(e) = pijul_graph.load_from_repo(&cli.repo) {

  + eprintln!("\x1b[31;1mError loading repository:\x1b[0m {}", e);

  + std::process::exit(1);

  + }

  +