Issue #234: add SHOW_FUTURE_EARNINGS_PAGE env var

[ethanstrominger]

Co-authored-by: dmeegan dn_meegan@yahoo.com Co-authored-by: Matan Kotler-Berkowitz 205matan@gmail.com

[thadk]

Hi @ethanstrominger did you set up a netlify site for this variable yet?

[thadk]

Because #236 has a change that temporarily breaks the line8line40 branch by removing the automatic minimum and maximum earnings year determinations for the detailed calculator. #233 almost already fixes by re-adding them at a higher level to the src/library/pia/index.ts AnyPIA-js wrapper, but it needs a fix on https://github.com/codeforboston/windfall-elimination/commit/b1d583df4a3263c0bf8a6ea00db9878891eba330#diff-c0920b50518efcd68fac7ddfdb01f6a9a18ddbed635af44f0fc8a65f27971affR75

It seems there is no harm in delaying this until we:

• [ ] have netlify setup with this feature toggle parameter set that is not ssacalculator.org on line8line40 branch to confirm everything looks okay.
• [x] can merge safely into the develop branch when #233 is fixed, which is the main goal of the feature branch.
• [ ] at that point, have the second feature toggle netlify re-pointed the netlify at the 'develop' branch.

[thadk]

I think we've fixed #236 but introduced another change we should handle at the next hacknight: https://github.com/codeforboston/windfall-elimination/commit/93990a92d6410e796d802ae72196c19898c5a3b5

• [ ] The first earnings page should not show all the possible years of income to enter. The extra years should ideally appear on the future earnings page. (see #228 "On main earnings list page in table, hide years after the current year for XML/PDF/Manual")