docs: update introduction page

[jjmachan]

Description

Motivation and Context

How Has This Been Tested?

Checklist:

• My code follows the bentoctl code style, both make format and
  make lint script have passed
• My change reduces project test coverage and requires unit tests to be added
• I have added unit tests covering my code change
• My change requires a change to the documentation
• I have updated the documentation accordingly

[codecov]

Codecov Report

Merging #135 (31284e7) into main (020535c) will decrease coverage by 0.02%.
The diff coverage is 72.50%.

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   72.22%   72.20%   -0.03%     
==========================================
  Files          16       18       +2     
  Lines         893      957      +64     
==========================================
+ Hits          645      691      +46     
- Misses        248      266      +18     

Flag	Coverage Δ
unit-tests	72.20% <72.50%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
bentoctl/utils/temp_dir.py	76.00% <ø> (ø)
bentoctl/utils/terraform.py	34.28% <ø> (ø)
bentoctl/cli/utils.py	73.52% <60.52%> (-16.80%)	⬇️
bentoctl/utils/__init__.py	71.42% <71.42%> (ø)
bentoctl/cli/__init__.py	85.55% <75.00%> (-1.35%)	⬇️
bentoctl/utils/usage_stats.py	95.00% <95.00%> (ø)

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