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Clarify directory navigation terminology

Fix #1108.

Close #1104.

Fix #1101.

Fix #1096.

Also get this error when the program isn't installed.

Fix #1081.

Added some amplified language to help learners anticipate when 'man' or '--help' options might be best for common environments.

Fix #1089.

Fix #1093.

Changed the code to reflect the redirects-and-pipes.svg instead of the original redirects-and-pipes.png.

Explain how to clear the terminal.
Fix #784

Improve consistency of wording

Explain connection between Desktop directory and the GUI desktop

Explain connection between Desktop directory and the GUI desktop

Change "onto Desktop" to "into Desktop directory" to make it more command-line centric.

ls -F edits

Make text consistent with code block.

Co-authored-by: Dustin King <daking@alumni.stanford.edu>

Fix #1094.

Clarify "longest file" solution in ep6

Modify exercise example to make it runnable.
Fix #861.

The solution script to determine the longest file has no explanation:
add a reminder that wc outputs a line with totals for more than one
file.  We can also build pipelines up to be certain we know what is
output at each stage.

Add new section header 

Added new header to portion where we switch to talking about moving through directories to seperate it from the discussion on help commands

Fix #1083.

Improve clarity of wording in wildcard exercise

The existing proposed solution to files ending in A.txt or B.txt exercise at the end says it uses two expressions, but actually it uses two commands. However the two command solution is useful for the follow up questions. I reworded the the wildcard exercise at the end to use the term commands instead of expressions, and also included an extra solution with two expressions (arguments)

* Fixing capitalization of Ctrl-r and adding more detailed explanation

Ctrl-R doesn't work on all OS's while Ctrl-r does and is less ambiguous.

Same for Ctrl-C, using Ctrl-c is clearer

I also added an extra example of using the history command

* Fixing keyboard commands and adding history examples

I fixed the highlighting of keyboard commands to comply with the style guide.
These included <kbd>Ctrl</kbd>+<kbd>R</kbd> for example, as well as Ctrl-C and
Enter in a few places.

I also added some explanation to the history lookup commands and provided an
additional mechanism of using !head:p to recall the last command staring with 'head'.

* Removed a section I added at Gabriel's request

Gabriel thought the section I added went beyond the scope of an
introductory lesson.  I've removed it to get the rest of the PR resolved.

Change wc option -c (byte count) to -m (char count)