docs(getting_started): update the ways to install materialize

[LoganTann]

Proposed changes

fixes #178 and took that opportunity to update the whole page. Requesting reviews.

• 🆙 moved from bower:materialize to yarn:@materializecss/materialize (since bower is deprecated).
• 🗑️ removed Meteor and Ember packages (since they are using 0.100)

Screenshots (if appropriate) or codepen:

Reading the diffs should do the job 😀.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to change).
• docs

Checklist:

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[roiLeo]

LGTM

[LoganTann]

b5f4528 -> is it safe to delete package.js ?
It seems it's only used in meteor package manager and we deleted it in the docs

[LoganTann]

Requesting reviews for this PR to be merged.

[DanielRuf]

Requesting reviews for this PR to be merged.

In this case please choose materializecss/members then =)
I've done that now.

Anyone with write permissions should be able to merge then. cc @materializecss/members-write-access @materializecss/maintainers