Remove sections / features of E2E support
Add figure1.png sans E2E support

Try to simplify the figure by removing the kinds of arrows used.
Link to local figure1.png
Rename 'binned' role to 'bins'
Provide high-level overview of TUF.

Provide overview of TUF for project developers who may not be familiar with TUF.
List attacks being addressed by the integration.
Refactor the subsection on consistent snapshots
Remove mention of maximum security model roles in 'producing consistent snapshots' section
Simplify subsection by removing sentences that mention upcoming topics
Restructure 'recovering from a repository compromise'
Add more high-level information about TUF, repository attacks prevented, and remove unneeded sections.
Format list of attacks prevented
Restructure sections
Remove 'PyPI and TUF Metadata' subsection
More edits to structure
Remove the example of a compromised claimed project in 'Auditing Snapshots'
Add table (rst format) to 'Key Compromise Analysis' section
Change heading format of the compromise analyses table
Fix spacing in table
Format table
Modify arrow type in figure1.png