docs: rfc of  proposed introduction of formik
docs: rfc of  proposed introduction of formik

(FE-2283) Add table of contents

(FE-2283) Create "Code examples: Checkbox and CheckboxGroup"

(FE-2283) Create "Checkbox usage with Formik"

(FE-2283) Create "Validation examples"

(FE-2283) Create "Simplification using <Field>"

(FE-2283) Create "CheckboxGroup example"

(FE-2283) Create "CheckboxGroup example: controlled"

(FE-2283) Fix typo: CRSF / CSRF

(FE-2283) Add documentation about uncontrolled components

(FE-2283) Create "Field-level validation example"

(FE-2283) Create "No support for non-blocking validations"

(FE-2283) (FE-2088) Create "Blocking navigation on unsaved changes"

docs: adds content to alternatives section

(FE-2283) Fix typos

docs: revert link format

Co-Authored-By: Michael <50172266+kyanmichael@users.noreply.github.com>

(FE-2283) Add non-blocking Yup example code

docs: updates the remaining sections

Adds content to "Adoption Strategy" and "How We Teach this sections"

chore: fix typos

docs: add more detail to adoption strategy

chore: add further detail about adoption stategy

chore: rewords and fixes typos

docs: add further detail to adoption strategy

chore: remove special chars in broken link

Sage/carbon,Sage/carbon,Sage/carbon