doc: moved near-sdk-macros doc to near-sdk crate.

[akorchyn]

Resolves: #1288

• Replaced ignore -> rust for examples to be able to test them in CI

[akorchyn]

@race-of-sloths

[race-of-sloths]

@akorchyn Thank you for your contribution! Your pull request is now a part of the Race of Sloths!
Congratulatory messages are spent out! Your results have exceeded our imagination!

Current status: executed

Reviewer	Score
@dj8yfo	8

Your contribution is much appreciated with a final score of 8!
You have received 160 (80 base + 25 weekly bonus + 40 monthly bonus + 10% lifetime bonus) Sloth points for this contribution

@dj8yfo received 25 Sloth Points for reviewing and scoring this pull request.

Congratulations @akorchyn! Your PR was highly scored and you completed another monthly streak! To keep your monthly streak make another pull request next month and get 8+ score for it

What is the Race of Sloths

Race of Sloths is a friendly competition where you can participate in challenges and compete with other open-source contributors within your normal workflow

For contributors:

• Tag @race-of-sloths inside your pull requests
• Wait for the maintainer to review and score your pull request
• Check out your position in the Leaderboard
• Keep weekly and monthly streaks to reach higher positions
• Boast your contributions with a dynamic picture of your Profile

For maintainers:

• Score pull requests that participate in the Race of Sloths and receive a reward
• Engage contributors with fair scoring and fast responses so they keep their streaks
• Promote the Race to the point where the Race starts promoting you
• Grow the community of your contributors

Feel free to check our website for additional details!

Bot commands

• For contributors
  • Include a PR: @race-of-sloths include to enter the Race with your PR
• For maintainers:
  • Invite contributor @race-of-sloths invite to invite the contributor to participate in a race or include it, if it's already a runner.
  • Assign points: @race-of-sloths score [1/2/3/5/8/13] to award points based on your assessment.
  • Reject this PR: @race-of-sloths exclude to send this PR back to the drawing board.
  • Exclude repo: @race-of-sloths pause to stop bot activity in this repo until @race-of-sloths unpause command is called

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.23%. Comparing base (cc22bb2) to head (70a2e6b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1295   +/-   ##
=======================================
  Coverage   80.23%   80.23%           
=======================================
  Files         104      104           
  Lines       14819    14819           
=======================================
  Hits        11890    11890           
  Misses       2929     2929           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dj8yfo]

@race-of-sloths score 8

### Tasks
- [x] near_sdk_macros::ext_contract
- [x] near_sdk_macros::near
- [x] near_sdk_macros::near_bindgen
- [x] near_sdk_macros::BorshStorageKey
- [x] near_sdk_macros::EventMetadata
- [x] near_sdk_macros::FunctionError
- [x] near_sdk_macros::NearSchema
- [x] near_sdk_macros::PanicOnDefault
- [ ] add BIG BIG HIGHLIGHTED link from QuickStart section, leading to `#[near]` documentation

[dj8yfo]

near_bindgen can be cut and pasted just after near, because they're both twin brothers, one handsome, another - an ugly one

[dj8yfo]

@akorchyn could you also grab the deletion of this fragment from README as part of this pr?
I don't think it's too relevant now and it just increases README size.