Change min symbols for Step1 description field

[katerynakostikova]

• [x] Rename "Briefly tell employers about your experience" field to "Introduce yourself"
• [x] Change the placeholder to "Candidates who share more about their experience have higher chances of getting a job offer." (only if it'll be shown well on mobile view)
• [ ] Change the min length validation to 100 symbols.
• [ ] Change the validation message according to the new rule.

[ed9ward]

Added new description

[katerynakostikova]

Build in 15 min

[katerynakostikova]

https://bsa2023.slack.com/archives/C05PZJMEV8V/p1695200050965939

[ed9ward]

Need to add text break to a new line

[katerynakostikova]

Build in 15 min

[katerynakostikova]

https://bsa2023.slack.com/archives/C05PZJMEV8V/p1695289114650759

[ed9ward]

Tested