Some documentation/README updates

docs/main.md

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-# kern.
-
-Kern is a 32-bit x86 based operating system.
-
-What does that mean? 
-Well, 32-bit means that it can access $2^{32}$ different memory addresses.
-x86 is the processor architecture it is built upon.
-
-## Command Line
-Kern uses a shell (for now), so you'll have to type commands to do stuff.
-It is currently quite simple. It supports these commands:
-
-- clear: Clears the screen
-- disk \<r/w> \<sector> [data]: Reads/Writes data from/to sector on disk
-- echo \<msg>: Prints msg to the screen
-- exit: Exits the shell
-- help: Prints all available commands
-- ls: Prints all files
-- reboot: Reboots the system
-- test: Tests the newest feature _Debug_
-
-You can also print/run files by typing their filename (More in **Filesystem**)
-
-## Filesystem
-Kern has a custom filesystem. This filesystem works as a simple filetable.
-It doesn't support directories at the moment.
-Here's a list of supported filetypes:
-
-| Type | Description | CLI Behaivour |
-| ---- | ----------- | ------------- |
-| .bin | Executable binary | Executes file |
-| .txt | Raw ASCII text file | Prints out file content |
-| .tab | Filetable format | Prints files in filetable |
-| .dat | Data Binary | Prints HEX content of file |
-| .asm | Assembly source code | Prints out file content |
-
-### Filetable format 
-The filetable format (.tab) is a binary file containing
-
-| Byte(s) | Content  |
-| ------- | -------- |
-| 0-9     | Filename |
-| 10-12   | Filetype |
-| 13      | Number of filetable entries |
-| 14      | Starting sector |
-| 15      | File Length (in sectors) |
-