[3pt] [Contribution Guide]: TOC revising

[veod32]

Related to #1655

Revise high-level CG TOC based on discussion with @Totktonada -- mainly on Development part.

1. Introduction (landing page -- revised https://www.tarantool.io/en/doc/latest/contributing/contributing/)
2. Development
   • Development workflow overview
   • Seting up development environment
   • Making build
   • Running tests
   • Coding
   • Writting tests
   • Before sending patch
   • Self-review checklist
   • Sending patch
   • C style guide
   • Lua style guide
3. Feedbacks and suggestions
   • Submitting feedbacks and suggestions
   • Bug reporting -- может относиться сюда, а не к разделу Development; что-то уже есть в док-ции /admin
4. Documentation
   • Contributing to Tarantool documentation
   • Documentation style guide

[artur-barsegyan]

Need review with @Totktonada and @Mons

[NickVolynkin]

Planning:

• finalize TOC structure
• make new issues for each child document

[NickVolynkin]

Btw, did we look at the amount of page visits? We could move more popular pages up a level.

[artur-barsegyan]

Btw, did we look at the amount of page visits? We could move more popular pages up a level.

I have that report. You can ping me on Telegram.

[NickVolynkin]

Related issue: #1797