Update installation docs

[prabhupant]

Fixes #554

Checklist

• [x] I have read the Contribution & Best practices Guide and my PR follows them.
• [x] My branch is up-to-date with the Upstream master branch.
• [x] I have added necessary documentation (if appropriate)

Changes proposed in this pull request:

• Improved the installation docs of local

[codecov[bot]]

Codecov Report

Merging #555 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #555   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files          30       30           
  Lines         896      896           
=======================================
  Hits          823      823           
  Misses         73       73

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 9bfa3e2...8d76a6b. Read the comment docs.

[bhaveshAn]

After deep look into PR I don't think these changes are relevant. Mostly its on adding $ before each command, adding Step in each step or combining two or more lines in a single line. Current docs of local installation are well descriptive and organized https://github.com/fossasia/query-server/blob/master/docs/installation/local.md Hence closing