R1:7ca483543807

Simplify database initialization, fix default data

Summary:
Some users have had problems with the database initialization process, simplify
it by creating a new "initialize.sql" dump at v34.

I also populated this dump with the right landing screen (so all the tools
actually have links) and a default avatar.

Test Plan:
Dropped all databases, initialized according to documentation, ended up in a
good state with sensible defaults.

Reviewed By: jungejason
Reviewers: aran, jungejason, tuomaspelkonen
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