Document archive in UG

[JingYenLoh]

What this does

This PR documents the archive command that I added in #102 to our User Guide. I think I also fix our markdown table formatting, but I'm not very sure how GFM deals with tables, and I don't really want to dive into a manual investigation 😫

How to test

1. Read the documentation I've written for the command and see if it's appropriate.

Notes

The sea is bright.

[codecov-io]

Codecov Report

Merging #108 into master will increase coverage by 8.94%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #108      +/-   ##
============================================
+ Coverage     60.80%   69.75%   +8.94%     
- Complexity      702      839     +137     
============================================
  Files           128      128              
  Lines          2610     2906     +296     
  Branches        308      379      +71     
============================================
+ Hits           1587     2027     +440     
+ Misses          939      765     -174     
- Partials         84      114      +30     

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/resireg/logic/commands/RedoCommand.java	100.00% <0.00%> (ø)	7.00% <0.00%> (+3.00%)
...java/seedu/resireg/logic/commands/UndoCommand.java	100.00% <0.00%> (ø)	8.00% <0.00%> (+4.00%)
...a/seedu/resireg/logic/parser/AddCommandParser.java	100.00% <0.00%> (ø)	9.00% <0.00%> (+4.00%)
...du/resireg/logic/parser/AddAliasCommandParser.java	100.00% <0.00%> (ø)	9.00% <0.00%> (+4.00%)
...du/resireg/logic/parser/ListRoomCommandParser.java	100.00% <0.00%> (ø)	7.00% <0.00%> (+1.00%)
src/main/java/seedu/resireg/model/room/Room.java	70.27% <0.00%> (+2.70%)	18.00% <0.00%> (+1.00%)
...resireg/logic/parser/DeleteAliasCommandParser.java	11.11% <0.00%> (+2.77%)	2.00% <0.00%> (+1.00%)
...ain/java/seedu/resireg/logic/parser/CliSyntax.java	94.11% <0.00%> (+3.20%)	1.00% <0.00%> (ø%)
...java/seedu/resireg/logic/commands/EditCommand.java	90.37% <0.00%> (+3.31%)	24.00% <0.00%> (+12.00%)
.../seedu/resireg/logic/commands/ListRoomCommand.java	83.33% <0.00%> (+3.33%)	13.00% <0.00%> (+6.00%)
... and 13 more

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[jetnew]

LGTM!