add different install instructions for release and dev

[cjyetman]

• closes docs: Remove CRAN installation instructions until it is actually on CRAN #217
• sets us up to do Once on CRAN, update README.md with CRAN installation instructions #210 very easily once it's released on CRAN (by simply removing the comment fences)

note: also removes the text saying which repo install.packages() installs from, which technically can not be know since it's dependent on the user's setup

note: also removes the text about verifying the install with library(pacta.multi.loanbook) because I don't think that makes much sense nor is it really a great way to actually verify install

[jdhoffa]

It's hard for me to test if the ::: {.pkgdown-release} chunks render without seeing it on pkgdown, but I'll take your word!

The README.md does not seem to render as expected though.

[cjyetman]

It's hard for me to test if the ::: {.pkgdown-release} chunks render without seeing it on pkgdown, but I'll take your word!

The README.md does not seem to render as expected though.

one can run pkgdown::build_site() to see the result locally

[jdhoffa]

🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.00%. Comparing base (18c7df7) to head (8d4ee50).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #235   +/-   ##
=======================================
  Coverage   49.00%   49.00%           
=======================================
  Files          28       28           
  Lines        3253     3253           
=======================================
  Hits         1594     1594           
  Misses       1659     1659           

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