docs(README): fix removed $ sign in the ins

[isandesh7]

The $ sign makes the copy button useless. removing it.
it copies over the $ causing the command to fail when copied.

$ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force

Summary by Sourcery

Documentation:

• Remove '$' prefix from example commands in README.

[sourcery-ai]

Reviewer's Guide by Sourcery

The pull request removes the '$' character from the beginning of several commands in the README.md file. This was done to prevent users from copying the '$' character when copying the commands, which would cause the commands to fail.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
The '$' sign was removed from the beginning of several lines in the README.md file.	Removed '$' from pip install command. Removed '$' from pipx install command. Removed '$' from tmuxp load commands.	README.md

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[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Hey @isandesh7 - I've reviewed your changes - here's some feedback:

Overall Comments:

• This is a good change to make the examples more copy/paste friendly.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[tony]

Makes sense, thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.07%. Comparing base (da00754) to head (e258cc9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #976   +/-   ##
=======================================
  Coverage   73.07%   73.07%           
=======================================
  Files          26       26           
  Lines        1857     1857           
  Branches      352      352           
=======================================
  Hits         1357     1357           
  Misses        396      396           
  Partials      104      104           

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