modified: quickstart/about-star.md -> moved everything under the overview section and got rid of the introduction section. Also made some slight changes to the wording of the paragraphs

moified: quickstart/about-star.md -> added Overview subsection and simplified and summarized the previous text

added: about-star.md and the Introduction content.
renamed: Star folder to 'Getting Started' and moved quickstart.md under it.

Removed extra slurm files and moved our own version under the stallo's folder and renamed it to Slurm Jobs instead of Jobs

1) Deleted Stallo's env module page and added our own completed version under the Software section. 2) Deleted Guides folder and moved the Slurm doc under the Jobs setion (Will further have to incorporate both versions)