Made link to admin docs explicit to help Mkdocs with resolving

[geekysquirrel]

Hopefully this fixes #3152

I have:

• Formatted any Python files with black
• Brought the branch up to date with master
• Added any relevant Github labels
• Added tests for any new additions
• Added or updated any relevant documentation
• Added an Architectural Decision Record (ADR), if appropriate
• Added an MPLv2 License Header if appropriate
• Updated the Changelog

Description

This updates the install.md file in the docs to fix an issue links generated by MKdocs.

[cypress]

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Test summary

43 • 0 • 0 • 0

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Run details

Project	FlowAuth
Status	Passed
Commit	44a3fbf
Started	Oct 19, 2020 6:00 PM
Ended	Oct 19, 2020 6:02 PM
Duration	02:18 💡
OS	Linux Debian - 8.11
Browser	Electron 80

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[codecov]

Codecov Report

Merging #3156 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3156   +/-   ##
=======================================
  Coverage   93.51%   93.51%           
=======================================
  Files         251      251           
  Lines       10042    10042           
  Branches      858      858           
=======================================
  Hits         9391     9391           
  Misses        523      523           
  Partials      128      128           

Flag	Coverage Δ
#autoflow_unit_tests	92.99% <ø> (ø)
#flowapi_unit_tests	72.84% <ø> (ø)
#flowauth_unit_tests	78.39% <ø> (ø)
#flowclient_unit_tests	80.25% <ø> (ø)
#flowetl_unit_tests	95.38% <ø> (ø)
#flowkit_jwt_generator_unit_tests	95.10% <ø> (ø)
#flowmachine_unit_tests	90.79% <ø> (ø)
#integration_tests	66.99% <ø> (ø)

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[greenape]

Yup, that fixes it, thanks! 👍