Update 01.abstract.md

I just deleted most of the abstract except two sentences

content/01.abstract.md

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 ## Abstract {.page_break_before}
 
-Manubot is an open source tool for writing manuscripts on GitHub in markdown format.
-Manubot applies the git-based software workflow to scholarly writing, enabling enhanced transparency, collaboration, automation, and reproducibility.
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-This manuscript is a Manubot demo, intended to give users a playground to practice using Manubot.
-Everyone is encouraged to try writing with Manubot by editing this manuscript.
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-Manubot is described in the paper titled "Open collaborative writing with Manubot" [@url:https://greenelab.github.io/meta-review].
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-Test my understanding
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-Just a paper [@url:https://www.nature.com/articles/nature18003]
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-Manubot is not described in [@url:https://mir-mohammad.github.io].
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-Manubot is described in the paper titled "Open collaborative writing with Manubot" [@url:https://greenelab.github.io/meta-review].
-Okay
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-Ok attempting to do this in the correct order. test.
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-This is the updation done by Mohsin in the manuscript.
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-Test the workflow of manubot and its citation rule [@url:https://www.biorxiv.org/content/10.1101/2023.01.21.525030v1.full]
-Trial by me
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-Manubot is described in the paper titled "Open collaborative writing with Manubot".
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-Testing this
+Testing this. I want to learn how to use this tool