fix: manually set @angular/platform-browser as optional peerDependency

[NachoVazquez]

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• The commit message follows our guidelines: CONTRIBUTING.md#commit
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PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

@angular/platform-browser is being added automatically as a peer dependency to the package.json on the build but is not treated manually.

Closes: #170

What is the new behavior?

We manually set @angular/platform-browser as an optional peerDependency on the package.json.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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