Some UI feedback and fixes for deployment

Needs fixing:

- [x] Typo in package search field placeholder: `Please entre a valid ...` -> `Please enter a valid ...`
- [x] Home page is listing git repositories: this is not a useful page, and should be removed or demoted in the background
- [ ] we need to explain something on the home page

On the package detail page:
- [x] "Text content for this note" box and form is confusing. We need to remove that for now
- [x] "Posts": These should be "Package Events"
- [ ] we should provide some details on what we are looking at, some URLs, locations, possibly also description, or other metadata, either fetched live or retrieved from PulrDB
- [ ] The "Posts" are not linking to anything, may be we could link PURLs and VCID to actual data
- [x] on a detail of comments for a "Post" the last update date is incorrect and never updated
- [ ] The plus one, minus one "validation" is not obvious.
- do the plusses add ti each other

On the signup page:
- [ ] remove all the password recommendations

Elsewhere:
- [x] The followers page icons are broken
- [ ] We need a link to help in the "More" Menu, and a bit more refinement.

Can be handled later:
- [ ] Top level menu "Create Git Repo": this is only exposed to admin "superuser", but eventually should go entirely and be replaced by settings
- [ ] we should the sans serif font for package details, use the same style as license detection tab for resource detail in SCIO
- [ ] We need a notion of an event type on a package: a new vulnerability, updates on affected or fixing versions, new versions, etc.