add io2 and modify documentation

[GwonsooLee]

Fixes: #86
Related: Relevant tracking issues, for context
Merge before/after: Dependent or prerequisite PRs

Description
Support io2 volume type. And add alias of log-level with v. Any command could be used with -v info|debug|warning.... Default value of log is changed from info to warning.

Additional

• Modify documentations

Release Note

- support io2 volume type.
- add iops configuration in the manifest file for supporting iops-required volume type
- Add alias of `log-level` with `v`. Any command could be used with `-v info|debug|warning...`. Default value of log is changed from info to warning

[codecov]

Codecov Report

Merging #103 into main will increase coverage by 0.16%.
The diff coverage is 35.29%.

@@           Coverage Diff            @@
##            main    #103      +/-   ##
========================================
+ Coverage   6.66%   6.82%   +0.16%     
========================================
  Files         24      24              
  Lines       3242    3251       +9     
========================================
+ Hits         216     222       +6     
- Misses      3015    3018       +3     
  Partials      11      11              

Impacted Files	Coverage Δ
pkg/aws/ec2.go	0.00% <0.00%> (ø)
pkg/constants/constants.go	75.00% <ø> (ø)
pkg/deployer/deployer.go	0.00% <0.00%> (ø)
pkg/builder/builder.go	46.01% <100.00%> (+0.87%)	⬆️

---

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 61efd85...fef72ac. Read the comment docs.

[asbubam]

👍