Update to readme.me and Flock docs

[LouisGrx]

This PR contains changes mainly to the docs section of the Flock repo. The templates.md files have been deleted, and the proposal.md has been enriched with a team section and several other elements.

The readme has been updated to highlight that team should apply at least a month before AGPs are due. The minimum grant amount required to apply has been changed from $1M to $300K.

Reviews both on format and content are very welcome.