CLC-3190: LiveUpdates: UpNext merged feed cache should expire at midnight every night

https://jira.media.berkeley.edu/jira/browse/CLC-3190

The UpNext merged feed now expires at midnight every night
instead of never expiring. Now, it will be fresh every day,
and should no longer show old data for first-time-in-the-morning logins.
CLC-3201 - Fix README
https://jira.media.berkeley.edu/jira/browse/CLC-3201

* Fix links
* Fix numbering (not only 1)
* Fix paths (use quotes)
* Set appropriate language for code (`bash` / `erb` / `html`)
* Make sure that people can copy/paste most code in the terminal. (E.g. comments in bash should have `#` in front of them)
* Remove sourcemaps - since we actually don't support it
Merge pull request #2066 from christianv/CLC-3201

CLC-3201 - Fix README
CLC-3202 - Remove <base> from the html
https://jira.media.berkeley.edu/jira/browse/CLC-3202
NOJIRA - Change tabs with spaces
CLC-3203 - Remove the obsolete CalCentral / UCB logo files in assets/svg
https://jira.media.berkeley.edu/jira/browse/CLC-3203
CLC-3204 - Badge / header icons animate from square to rounded
https://jira.media.berkeley.edu/jira/browse/CLC-3204
Merge pull request #2067 from christianv/CLC-3202

CLC-3202 - Remove <base> from the html
Merge pull request #2068 from christianv/nojira-fix-tabs

NOJIRA - Change tabs with spaces
Merge pull request #2069 from christianv/CLC-3203

CLC-3203 - Remove the obsolete CalCentral / UCB logo files in assets/svg
Merge pull request #2070 from christianv/CLC-3204

CLC-3204 - Badge / header icons animate from square to rounded
Merge pull request #2065 from chikoon/CLC-3190-expire-upnext-at-midnight

CLC-3190: LiveUpdates: UpNext merged feed cache should expire at midnight every night
CLC-2425 Relocate complex campus-data logic to a more appropriate directory
"lib/proxies" was intended more for straightforward proxying
CLC-2425 Instructor section nesting by Course Option
CLC-2425 Document the Course Option insanity
Merge pull request #2071 from raydavis/raywip

CLC-2425 Instructor section nesting by Course Option
CLC-3188: LiveUpdates: Hit updated_feeds API earlier and more often

https://jira.media.berkeley.edu/jira/browse/CLC-3188

The UI now makes the updated feeds request at the given intervals after page load: 2s, 5s, 15s, and then every 60 seconds after that.